57 lines
2.1 KiB
Plaintext
57 lines
2.1 KiB
Plaintext
From: Jeff Mahoney <jeffm@suse.com>
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Subject: Make reiserfs default to barrier=flush
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Patch-mainline: not yet
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Change the default reiserfs mount option to barrier=flush
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Signed-off-by: Jeff Mahoney <jeffm@suse.com>
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---
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fs/reiserfs/Kconfig | 22 ++++++++++++++++++++++
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fs/reiserfs/super.c | 3 +++
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2 files changed, 25 insertions(+)
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--- a/fs/reiserfs/Kconfig
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+++ b/fs/reiserfs/Kconfig
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@@ -50,6 +50,28 @@ config REISERFS_PROC_INFO
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Almost everyone but ReiserFS developers and people fine-tuning
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reiserfs or tracing problems should say N.
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+config REISERFS_DEFAULTS_TO_BARRIERS_ENABLED
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+ bool "Default to 'barrier=flush' in reiserfs"
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+ depends on REISERFS_FS
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+ help
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+ Modern disk drives support write caches that can speed up writeback.
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+ Some devices, in order to improve their performance statistics,
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+ report that the write has been completed even when it has only
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+ been committed to volatile cache memory. This can result in
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+ severe corruption in the event of power loss.
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+
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+ The -o barrier option enables the file system to direct the block
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+ layer to issue a barrier, which ensures that the cache has been
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+ flushed before proceeding. This can produce some slowdown in
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+ certain environments, but allows higher end storage arrays with
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+ battery-backed caches to report completes writes sooner than
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+ would be otherwise possible.
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+
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+ Without this option, disk write caches should be disabled if
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+ you value data integrity over writeback performance.
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+
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+ If unsure, say N.
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+
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config REISERFS_FS_XATTR
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bool "ReiserFS extended attributes"
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depends on REISERFS_FS
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--- a/fs/reiserfs/super.c
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+++ b/fs/reiserfs/super.c
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@@ -1626,6 +1626,9 @@ static int reiserfs_fill_super(struct su
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/* Set default values for options: non-aggressive tails, RO on errors */
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REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_SMALLTAIL);
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REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_ERROR_RO);
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+#ifdef CONFIG_REISERFS_DEFAULTS_TO_BARRIERS_ENABLED
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+ REISERFS_SB(s)->s_mount_opt |= (1 << REISERFS_BARRIER_FLUSH);
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+#endif
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/* no preallocation minimum, be smart in
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reiserfs_file_write instead */
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REISERFS_SB(s)->s_alloc_options.preallocmin = 0;
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