Lines Matching +full:write +full:- +full:0

2 dm-log-writes
6 of the write operations to.  This is intended for file system developers wishing
8 There is a log_write_entry written for every WRITE request and the target is
10 that is in the WRITE requests is copied into the log to make the replay happen
16 We log things in order of completion once we are sure the write is no longer in
17 cache.  This means that normal WRITE requests are not actually logged until the
22 This works by attaching all WRITE requests to a list once the write completes.
27 following example (W means write, C means complete):
42 Any REQ_OP_DISCARD requests are treated like WRITE requests.  Otherwise we would
43 have all the DISCARD requests, and then the WRITE requests and then the FLUSH
46 	WRITE block 1, DISCARD block 1, FLUSH
50 	DISCARD 1, WRITE 1, FLUSH
59    log-writes <dev_path> <log_dev_path>
81 	write, but first you need to replay up to the mkfs to make sure
85 	  mkfs.btrfs -f /dev/mapper/log
86 	  dmsetup message log 0 mark mkfs
93 	Every log has a mark at the end labeled "dm-log-writes-end".
99 It can be found here: https://github.com/josefbacik/log-writes
107   TABLE="0 $(blockdev --getsz /dev/sdb) log-writes /dev/sdb /dev/sdc"
108   dmsetup create log --table "$TABLE"
109   mkfs.btrfs -f /dev/mapper/log
110   dmsetup message log 0 mark mkfs
112   mount /dev/mapper/log /mnt/btrfs-test
114   dmsetup message log 0 mark fsync
115   md5sum /mnt/btrfs-test/foo
116   umount /mnt/btrfs-test
119   replay-log --log /dev/sdc --replay /dev/sdb --end-mark fsync
120   mount /dev/sdb /mnt/btrfs-test
121   md5sum /mnt/btrfs-test/foo
127   TABLE="0 $(blockdev --getsz /dev/sdb) log-writes /dev/sdb /dev/sdc"
128   dmsetup create log --table "$TABLE"
129   mkfs.btrfs -f /dev/mapper/log
130   dmsetup message log 0 mark mkfs
132   mount /dev/mapper/log /mnt/btrfs-test
134   btrfs filesystem balance /mnt/btrfs-test
135   umount /mnt/btrfs-test
138   replay-log --log /dev/sdc --replay /dev/sdb --end-mark mkfs
140   replay-log --log /dev/sdc --replay /dev/sdb --start-mark mkfs \
141 	--fsck "btrfsck /dev/sdb" --check fua