xfs: introduce XFS_BMAPI_STACK_SWITCH
Certain allocation paths through xfs_bmapi_write() are in situations where we have limited stack available. These are almost always in the buffered IO writeback path when convertion delayed allocation extents to real extents. The current stack switch occurs for userdata allocations, which means we also do stack switches for preallocation, direct IO and unwritten extent conversion, even those these call chains have never been implicated in a stack overrun. Hence, let's target just the single stack overun offended for stack switches. To do that, introduce a XFS_BMAPI_STACK_SWITCH flag that the caller can pass xfs_bmapi_write() to indicate it should switch stacks if it needs to do allocation. Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Mark Tinguely <tinguely@sgi.com> Signed-off-by: Ben Myers <bpm@sgi.com>
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@ -2447,7 +2447,7 @@ xfs_alloc_vextent(
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{
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DECLARE_COMPLETION_ONSTACK(done);
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if (!args->userdata)
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if (!args->stack_switch)
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return __xfs_alloc_vextent(args);
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@ -123,6 +123,7 @@ typedef struct xfs_alloc_arg {
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struct completion *done;
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struct work_struct work;
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int result;
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char stack_switch;
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} xfs_alloc_arg_t;
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/*
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@ -2441,6 +2441,7 @@ xfs_bmap_btalloc(
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args.tp = ap->tp;
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args.mp = mp;
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args.fsbno = ap->blkno;
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args.stack_switch = ap->stack_switch;
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/* Trim the allocation back to the maximum an AG can fit. */
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args.maxlen = MIN(ap->length, XFS_ALLOC_AG_MAX_USABLE(mp));
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@ -4675,6 +4676,9 @@ xfs_bmapi_allocate(
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return error;
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}
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if (flags & XFS_BMAPI_STACK_SWITCH)
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bma->stack_switch = 1;
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error = xfs_bmap_alloc(bma);
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if (error)
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return error;
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@ -77,6 +77,7 @@ typedef struct xfs_bmap_free
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* from written to unwritten, otherwise convert from unwritten to written.
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*/
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#define XFS_BMAPI_CONVERT 0x040
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#define XFS_BMAPI_STACK_SWITCH 0x080
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#define XFS_BMAPI_FLAGS \
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{ XFS_BMAPI_ENTIRE, "ENTIRE" }, \
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@ -85,7 +86,8 @@ typedef struct xfs_bmap_free
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{ XFS_BMAPI_PREALLOC, "PREALLOC" }, \
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{ XFS_BMAPI_IGSTATE, "IGSTATE" }, \
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{ XFS_BMAPI_CONTIG, "CONTIG" }, \
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{ XFS_BMAPI_CONVERT, "CONVERT" }
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{ XFS_BMAPI_CONVERT, "CONVERT" }, \
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{ XFS_BMAPI_STACK_SWITCH, "STACK_SWITCH" }
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static inline int xfs_bmapi_aflag(int w)
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@ -133,6 +135,7 @@ typedef struct xfs_bmalloca {
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char userdata;/* set if is user data */
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char aeof; /* allocated space at eof */
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char conv; /* overwriting unwritten extents */
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char stack_switch;
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} xfs_bmalloca_t;
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/*
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@ -575,7 +575,9 @@ xfs_iomap_write_allocate(
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* pointer that the caller gave to us.
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*/
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error = xfs_bmapi_write(tp, ip, map_start_fsb,
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count_fsb, 0, &first_block, 1,
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count_fsb,
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XFS_BMAPI_STACK_SWITCH,
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&first_block, 1,
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imap, &nimaps, &free_list);
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if (error)
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goto trans_cancel;
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