[PATCH 59/71] xfs: provide switch to force filesystem to copy-on-write all the time
"Darrick J. Wong" <[email protected]>
| Newsgroups | gmane.comp.file-systems.xfs.general |
|---|---|
| Message-ID | <[email protected]> |
Make it possible to force XFS to use copy on write all the time, at least if reflink is turned on. Signed-off-by: Darrick J. Wong <[email protected]> --- fs/xfs/xfs_globals.c | 1 + fs/xfs/xfs_linux.h | 1 + fs/xfs/xfs_reflink.c | 6 ++++++ fs/xfs/xfs_sysctl.c | 11 +++++++++++ fs/xfs/xfs_sysctl.h | 1 + 5 files changed, 20 insertions(+) diff --git a/fs/xfs/xfs_globals.c b/fs/xfs/xfs_globals.c index f3f6aa9..9a55966 100644 --- a/fs/xfs/xfs_globals.c +++ b/fs/xfs/xfs_globals.c @@ -43,6 +43,7 @@ xfs_param_t xfs_params = { .fstrm_timer = { 1, 30*100, 3600*100}, .eofb_timer = { 1, 300, 3600*24}, .cowb_timer = { 1, 300, 3600*24}, + .always_cow = { 0, 0, 1 }, }; struct xfs_globals xfs_globals = { diff --git a/fs/xfs/xfs_linux.h b/fs/xfs/xfs_linux.h index 68640fb..a9c1765 100644 --- a/fs/xfs/xfs_linux.h +++ b/fs/xfs/xfs_linux.h @@ -117,6 +117,7 @@ typedef __u32 xfs_nlink_t; #define xfs_fstrm_centisecs xfs_params.fstrm_timer.val #define xfs_eofb_secs xfs_params.eofb_timer.val #define xfs_cowb_secs xfs_params.cowb_timer.val +#define xfs_always_cow xfs_params.always_cow.val #define current_cpu() (raw_smp_processor_id()) #define current_pid() (current->pid) diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c index 0db3a34..1299a42 100644 --- a/fs/xfs/xfs_reflink.c +++ b/fs/xfs/xfs_reflink.c @@ -166,6 +166,12 @@ xfs_reflink_find_shared( struct xfs_btree_cur *cur; int error; + if (xfs_always_cow) { + *fbno = agbno; + *flen = aglen; + return 0; + } + error = xfs_alloc_read_agf(mp, NULL, agno, 0, &agbp); if (error) return error; diff --git a/fs/xfs/xfs_sysctl.c b/fs/xfs/xfs_sysctl.c index afe1f66..650b8d5 100644 --- a/fs/xfs/xfs_sysctl.c +++ b/fs/xfs/xfs_sysctl.c @@ -193,6 +193,17 @@ static struct ctl_table xfs_table[] = { .extra1 = &xfs_params.cowb_timer.min, .extra2 = &xfs_params.cowb_timer.max, }, +#ifdef DEBUG + { + .procname = "always_cow", + .data = &xfs_params.always_cow.val, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec_minmax, + .extra1 = &xfs_params.always_cow.min, + .extra2 = &xfs_params.always_cow.max, + }, +#endif /* please keep this the last entry */ #ifdef CONFIG_PROC_FS { diff --git a/fs/xfs/xfs_sysctl.h b/fs/xfs/xfs_sysctl.h index 984a349..16099dc 100644 --- a/fs/xfs/xfs_sysctl.h +++ b/fs/xfs/xfs_sysctl.h @@ -49,6 +49,7 @@ typedef struct xfs_param { xfs_sysctl_val_t fstrm_timer; /* Filestream dir-AG assoc'n timeout. */ xfs_sysctl_val_t eofb_timer; /* Interval between eofb scan wakeups */ xfs_sysctl_val_t cowb_timer; /* Interval between cowb scan wakeups */ + xfs_sysctl_val_t always_cow; /* Always copy on write? */ } xfs_param_t; /* _______________________________________________ xfs mailing list [email protected] http://oss.sgi.com/mailman/listinfo/xfs