Commit Graph

4 Commits (3b4e2d61961f7308885cce98bfecdf07d6c0ed01)

Author SHA1 Message Date
Miao Xie 3b4e2d6196 Btrfs-progs: fix several complie warning
This patch fixed the following warning:
cmds-send.c:464:6: warning: ‘ret' may be used uninitialized in this function [-Wuninitialized]
crc32c.c:121:1: warning: control reaches end of non-void function [-Wreturn-type]
send-utils.c:69:11: warning: ‘comp' may be used uninitialized in this function [-Wuninitialized]
send-utils.c:126:6: warning: ‘comp' may be used uninitialized in this function [-Wuninitialized]
send-utils.c:99:22: warning: ‘entry' may be used uninitialized in this function [-Wuninitialized]
btrfs.c:261:2: warning: implicit declaration of function ‘crc32c_optimization_init' [-Wimplicit-function-declaration]
btrfs.c:105:2: warning: ‘cmd' may be used uninitialized in this function [-Wuninitialized]
restore.c:435:12: warning: ignoring return value of ‘ftruncate', declared with attribute warn_unused_result [-Wunused-result]

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
2012-10-04 16:26:31 -04:00
Chris Mason 71687d74d0 Use intel hardware crc32c where available
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
2012-07-26 14:51:27 -04:00
Chris Mason 95d3f20b51 Mixed back reference (FORWARD ROLLING FORMAT CHANGE)
This commit introduces a new kind of back reference for btrfs metadata.
Once a filesystem has been mounted with this commit, IT WILL NO LONGER
BE MOUNTABLE BY OLDER KERNELS.

The new back ref provides information about pointer's key, level and in which
tree the pointer lives. This information allow us to find the pointer by
searching the tree. The shortcoming of the new back ref is that it only works
for pointers in tree blocks referenced by their owner trees.

This is mostly a problem for snapshots, where resolving one of these fuzzy back
references would be O(number_of_snapshots) and quite slow.  The solution used
here is to use the fuzzy back references in the common case where a given tree
block is only referenced by one root, and use the full back references when
multiple roots have a reference
2009-06-08 13:30:36 -04:00
Josef Bacik 4623a01bdc calculate checksums during IO 2007-06-28 16:20:29 -04:00