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author | Dan Williams <dan.j.williams@intel.com> | 2009-12-12 21:17:12 -0700 |
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committer | NeilBrown <neilb@suse.de> | 2009-12-14 12:58:57 +1100 |
commit | 06e3c817b750c131a20e82eed57a17841ea88ed2 (patch) | |
tree | 55da529f662c29da5b5fd202b5ece9fb907aa431 /Documentation/md.txt | |
parent | 4e59ca7da05f0d5d3ad40365c502c8b0fd24c7e3 (diff) | |
download | kernel_samsung_tuna-06e3c817b750c131a20e82eed57a17841ea88ed2.zip kernel_samsung_tuna-06e3c817b750c131a20e82eed57a17841ea88ed2.tar.gz kernel_samsung_tuna-06e3c817b750c131a20e82eed57a17841ea88ed2.tar.bz2 |
md: add 'recovery_start' per-device sysfs attribute
Enable external metadata arrays to manage rebuild checkpointing via a
md/dev-XXX/recovery_start attribute which reflects rdev->recovery_offset
Also update resync_start_store to allow 'none' to be written, for
consistency.
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>
Diffstat (limited to 'Documentation/md.txt')
-rw-r--r-- | Documentation/md.txt | 27 |
1 files changed, 23 insertions, 4 deletions
diff --git a/Documentation/md.txt b/Documentation/md.txt index 21d26fb..188f476 100644 --- a/Documentation/md.txt +++ b/Documentation/md.txt @@ -233,9 +233,9 @@ All md devices contain: resync_start The point at which resync should start. If no resync is needed, - this will be a very large number. At array creation it will - default to 0, though starting the array as 'clean' will - set it much larger. + this will be a very large number (or 'none' since 2.6.30-rc1). At + array creation it will default to 0, though starting the array as + 'clean' will set it much larger. new_dev This file can be written but not read. The value written should @@ -379,8 +379,9 @@ Each directory contains: Writing "writemostly" sets the writemostly flag. Writing "-writemostly" clears the writemostly flag. Writing "blocked" sets the "blocked" flag. - Writing "-blocked" clear the "blocked" flag and allows writes + Writing "-blocked" clears the "blocked" flag and allows writes to complete. + Writing "in_sync" sets the in_sync flag. This file responds to select/poll. Any change to 'faulty' or 'blocked' causes an event. @@ -417,6 +418,24 @@ Each directory contains: array. If a value less than the current component_size is written, it will be rejected. + recovery_start + + When the device is not 'in_sync', this records the number of + sectors from the start of the device which are known to be + correct. This is normally zero, but during a recovery + operation is will steadily increase, and if the recovery is + interrupted, restoring this value can cause recovery to + avoid repeating the earlier blocks. With v1.x metadata, this + value is saved and restored automatically. + + This can be set whenever the device is not an active member of + the array, either before the array is activated, or before + the 'slot' is set. + + Setting this to 'none' is equivalent to setting 'in_sync'. + Setting to any other value also clears the 'in_sync' flag. + + An active md device will also contain and entry for each active device in the array. These are named |