| Message ID | 20171016224940.1332-6-bart.vanassche@wdc.com (mailing list archive) |
|---|---|
| State | Not Applicable |
| Headers | show |
On 10/17/2017 12:49 AM, Bart Van Assche wrote: > Use the sgl_alloc_order() and sgl_free() functions instead of open > coding these functions. > > Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com> > Cc: Nicholas A. Bellinger <nab@linux-iscsi.org> > Cc: Christoph Hellwig <hch@lst.de> > Cc: Hannes Reinecke <hare@suse.com> > Cc: Sagi Grimberg <sagi@grimberg.me> > --- > drivers/target/Kconfig | 1 + > drivers/target/target_core_transport.c | 46 +++------------------------------- > 2 files changed, 5 insertions(+), 42 deletions(-) > > diff --git a/drivers/target/Kconfig b/drivers/target/Kconfig > index e2bc99980f75..4c44d7bed01a 100644 > --- a/drivers/target/Kconfig > +++ b/drivers/target/Kconfig > @@ -5,6 +5,7 @@ menuconfig TARGET_CORE > select CONFIGFS_FS > select CRC_T10DIF > select BLK_SCSI_REQUEST # only for scsi_command_size_tbl.. > + select SGL_ALLOC > default n > help > Say Y or M here to enable the TCM Storage Engine and ConfigFS enabled > diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c > index 836d552b0385..9bbd08be9d60 100644 > --- a/drivers/target/target_core_transport.c > +++ b/drivers/target/target_core_transport.c > @@ -2293,13 +2293,7 @@ static void target_complete_ok_work(struct work_struct *work) > > void target_free_sgl(struct scatterlist *sgl, int nents) > { > - struct scatterlist *sg; > - int count; > - > - for_each_sg(sgl, sg, nents, count) > - __free_page(sg_page(sg)); > - > - kfree(sgl); > + sgl_free(sgl); > } > EXPORT_SYMBOL(target_free_sgl); > > @@ -2423,42 +2417,10 @@ int > target_alloc_sgl(struct scatterlist **sgl, unsigned int *nents, u32 length, > bool zero_page, bool chainable) > { > - struct scatterlist *sg; > - struct page *page; > - gfp_t zero_flag = (zero_page) ? __GFP_ZERO : 0; > - unsigned int nalloc, nent; > - int i = 0; > - > - nalloc = nent = DIV_ROUND_UP(length, PAGE_SIZE); > - if (chainable) > - nalloc++; > - sg = kmalloc_array(nalloc, sizeof(struct scatterlist), GFP_KERNEL); > - if (!sg) > - return -ENOMEM; > + gfp_t gfp = GFP_KERNEL | (zero_page ? __GFP_ZERO : 0); > > - sg_init_table(sg, nalloc); > - > - while (length) { > - u32 page_len = min_t(u32, length, PAGE_SIZE); > - page = alloc_page(GFP_KERNEL | zero_flag); > - if (!page) > - goto out; > - > - sg_set_page(&sg[i], page, page_len, 0); > - length -= page_len; > - i++; > - } > - *sgl = sg; > - *nents = nent; > - return 0; > - > -out: > - while (i > 0) { > - i--; > - __free_page(sg_page(&sg[i])); > - } > - kfree(sg); > - return -ENOMEM; > + *sgl = sgl_alloc_order(length, 0, chainable, gfp, nents); > + return *sgl ? 0 : -ENOMEM; > } > EXPORT_SYMBOL(target_alloc_sgl); > > The calling convention from target_alloc_sgl() is decidedly dodgy. Can't we convert it into returning the sgl, and remove the first parameter? Cheers, Hannes
On Tue, 2017-10-17 at 08:14 +0200, Hannes Reinecke wrote: > On 10/17/2017 12:49 AM, Bart Van Assche wrote: > > [ ... ] > > void target_free_sgl(struct scatterlist *sgl, int nents) > > { > > - struct scatterlist *sg; > > - int count; > > - > > - for_each_sg(sgl, sg, nents, count) > > - __free_page(sg_page(sg)); > > - > > - kfree(sgl); > > + sgl_free(sgl); > > } > > EXPORT_SYMBOL(target_free_sgl); > > > > @@ -2423,42 +2417,10 @@ int > > target_alloc_sgl(struct scatterlist **sgl, unsigned int *nents, u32 length, > > bool zero_page, bool chainable) > > { > > - [ ... ] > > + *sgl = sgl_alloc_order(length, 0, chainable, gfp, nents); > > + return *sgl ? 0 : -ENOMEM; > > } > > EXPORT_SYMBOL(target_alloc_sgl); > > > > The calling convention from target_alloc_sgl() is decidedly dodgy. > > Can't we convert it into returning the sgl, and remove the first parameter? Hello Hannes, Another option is to remove the target_alloc_sgl() and target_free_sgl() functions and to make LIO target drivers call sgl_alloc_order() and sgl_free_order() directly. Do you perhaps have a preference for one of these two approaches? Thanks, Bart.
diff --git a/drivers/target/Kconfig b/drivers/target/Kconfig index e2bc99980f75..4c44d7bed01a 100644 --- a/drivers/target/Kconfig +++ b/drivers/target/Kconfig @@ -5,6 +5,7 @@ menuconfig TARGET_CORE select CONFIGFS_FS select CRC_T10DIF select BLK_SCSI_REQUEST # only for scsi_command_size_tbl.. + select SGL_ALLOC default n help Say Y or M here to enable the TCM Storage Engine and ConfigFS enabled diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c index 836d552b0385..9bbd08be9d60 100644 --- a/drivers/target/target_core_transport.c +++ b/drivers/target/target_core_transport.c @@ -2293,13 +2293,7 @@ static void target_complete_ok_work(struct work_struct *work) void target_free_sgl(struct scatterlist *sgl, int nents) { - struct scatterlist *sg; - int count; - - for_each_sg(sgl, sg, nents, count) - __free_page(sg_page(sg)); - - kfree(sgl); + sgl_free(sgl); } EXPORT_SYMBOL(target_free_sgl); @@ -2423,42 +2417,10 @@ int target_alloc_sgl(struct scatterlist **sgl, unsigned int *nents, u32 length, bool zero_page, bool chainable) { - struct scatterlist *sg; - struct page *page; - gfp_t zero_flag = (zero_page) ? __GFP_ZERO : 0; - unsigned int nalloc, nent; - int i = 0; - - nalloc = nent = DIV_ROUND_UP(length, PAGE_SIZE); - if (chainable) - nalloc++; - sg = kmalloc_array(nalloc, sizeof(struct scatterlist), GFP_KERNEL); - if (!sg) - return -ENOMEM; + gfp_t gfp = GFP_KERNEL | (zero_page ? __GFP_ZERO : 0); - sg_init_table(sg, nalloc); - - while (length) { - u32 page_len = min_t(u32, length, PAGE_SIZE); - page = alloc_page(GFP_KERNEL | zero_flag); - if (!page) - goto out; - - sg_set_page(&sg[i], page, page_len, 0); - length -= page_len; - i++; - } - *sgl = sg; - *nents = nent; - return 0; - -out: - while (i > 0) { - i--; - __free_page(sg_page(&sg[i])); - } - kfree(sg); - return -ENOMEM; + *sgl = sgl_alloc_order(length, 0, chainable, gfp, nents); + return *sgl ? 0 : -ENOMEM; } EXPORT_SYMBOL(target_alloc_sgl);
Use the sgl_alloc_order() and sgl_free() functions instead of open coding these functions. Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com> Cc: Nicholas A. Bellinger <nab@linux-iscsi.org> Cc: Christoph Hellwig <hch@lst.de> Cc: Hannes Reinecke <hare@suse.com> Cc: Sagi Grimberg <sagi@grimberg.me> --- drivers/target/Kconfig | 1 + drivers/target/target_core_transport.c | 46 +++------------------------------- 2 files changed, 5 insertions(+), 42 deletions(-)