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Message-ID: <20131007183743.GB6860@birch.djwong.org> Date: Mon, 7 Oct 2013 11:37:43 -0700 From: "Darrick J. Wong" <darrick.wong@...cle.com> To: Lukáš Czerner <lczerner@...hat.com> Cc: tytso@....edu, linux-ext4@...r.kernel.org Subject: Re: [PATCH 15/31] e2fsck: Teach EA refcounting code to handle 48bit block addresses On Mon, Oct 07, 2013 at 05:30:17PM +0200, Lukáš Czerner wrote: > On Mon, 30 Sep 2013, Darrick J. Wong wrote: > > > Date: Mon, 30 Sep 2013 18:28:18 -0700 > > From: Darrick J. Wong <darrick.wong@...cle.com> > > To: tytso@....edu, darrick.wong@...cle.com > > Cc: linux-ext4@...r.kernel.org > > Subject: [PATCH 15/31] e2fsck: Teach EA refcounting code to handle 48bit block > > addresses > > Did you meant to say 64bit ? Yep. > > > > > The extended attribute refcounting code only accepts blk_t, which is dangerous > > because EA blocks can exist at high addresses (> 2^32) as well. Therefore, > > widen the block fields to 64 bits. > > > > Signed-off-by: Darrick J. Wong <darrick.wong@...cle.com> > > --- > > e2fsck/e2fsck.h | 12 ++++++------ > > e2fsck/ea_refcount.c | 36 ++++++++++++++++++------------------ > > 2 files changed, 24 insertions(+), 24 deletions(-) > > > > > > diff --git a/e2fsck/e2fsck.h b/e2fsck/e2fsck.h > > index 13d70f1..f1df525 100644 > > --- a/e2fsck/e2fsck.h > > +++ b/e2fsck/e2fsck.h > > @@ -432,17 +432,17 @@ extern struct dx_dir_info *e2fsck_dx_dir_info_iter(e2fsck_t ctx, int *control); > > /* ea_refcount.c */ > > extern errcode_t ea_refcount_create(int size, ext2_refcount_t *ret); > > extern void ea_refcount_free(ext2_refcount_t refcount); > > -extern errcode_t ea_refcount_fetch(ext2_refcount_t refcount, blk_t blk, > > +extern errcode_t ea_refcount_fetch(ext2_refcount_t refcount, blk64_t blk, > > int *ret); > > extern errcode_t ea_refcount_increment(ext2_refcount_t refcount, > > - blk_t blk, int *ret); > > + blk64_t blk, int *ret); > > extern errcode_t ea_refcount_decrement(ext2_refcount_t refcount, > > - blk_t blk, int *ret); > > + blk64_t blk, int *ret); > > extern errcode_t ea_refcount_store(ext2_refcount_t refcount, > > - blk_t blk, int count); > > -extern blk_t ext2fs_get_refcount_size(ext2_refcount_t refcount); > > + blk64_t blk, int count); > > +extern blk64_t ext2fs_get_refcount_size(ext2_refcount_t refcount); > > extern void ea_refcount_intr_begin(ext2_refcount_t refcount); > > -extern blk_t ea_refcount_intr_next(ext2_refcount_t refcount, int *ret); > > +extern blk64_t ea_refcount_intr_next(ext2_refcount_t refcount, int *ret); > > > > /* ehandler.c */ > > extern const char *ehandler_operation(const char *op); > > diff --git a/e2fsck/ea_refcount.c b/e2fsck/ea_refcount.c > > index e66e636..bcce6a0 100644 > > --- a/e2fsck/ea_refcount.c > > +++ b/e2fsck/ea_refcount.c > > @@ -25,14 +25,14 @@ > > * checked, its bit is set in the block_ea_map bitmap. > > */ > > struct ea_refcount_el { > > - blk_t ea_blk; > > + blk64_t ea_blk; > > int ea_count; > > }; > > > > struct ea_refcount { > > - blk_t count; > > - blk_t size; > > - blk_t cursor; > > + blk64_t count; > > + blk64_t size; > > + blk64_t cursor; > > I am not sure if we really need count, size and cursor to be blk_t > let alone blk64_t. It's a bit misleading because AFAICT those > variable does not represent block numbers at all. Maybe it should be > changed to something less confusing, preferably matching the actual > xattr implementation ? Oops, I got a little too s/blk_t/blk64_t/ happy there. Those could be __u32, I think. Or unsigned long. --D > > Thanks! > -Lukas > > > struct ea_refcount_el *list; > > }; > > > > @@ -111,11 +111,11 @@ static void refcount_collapse(ext2_refcount_t refcount) > > * specified position. > > */ > > static struct ea_refcount_el *insert_refcount_el(ext2_refcount_t refcount, > > - blk_t blk, int pos) > > + blk64_t blk, int pos) > > { > > struct ea_refcount_el *el; > > errcode_t retval; > > - blk_t new_size = 0; > > + blk64_t new_size = 0; > > int num; > > > > if (refcount->count >= refcount->size) { > > @@ -153,7 +153,7 @@ static struct ea_refcount_el *insert_refcount_el(ext2_refcount_t refcount, > > * and we can't find an entry, create one in the sorted list. > > */ > > static struct ea_refcount_el *get_refcount_el(ext2_refcount_t refcount, > > - blk_t blk, int create) > > + blk64_t blk, int create) > > { > > int low, high, mid; > > > > @@ -206,7 +206,7 @@ retry: > > return 0; > > } > > > > -errcode_t ea_refcount_fetch(ext2_refcount_t refcount, blk_t blk, > > +errcode_t ea_refcount_fetch(ext2_refcount_t refcount, blk64_t blk, > > int *ret) > > { > > struct ea_refcount_el *el; > > @@ -220,7 +220,7 @@ errcode_t ea_refcount_fetch(ext2_refcount_t refcount, blk_t blk, > > return 0; > > } > > > > -errcode_t ea_refcount_increment(ext2_refcount_t refcount, blk_t blk, int *ret) > > +errcode_t ea_refcount_increment(ext2_refcount_t refcount, blk64_t blk, int *ret) > > { > > struct ea_refcount_el *el; > > > > @@ -234,7 +234,7 @@ errcode_t ea_refcount_increment(ext2_refcount_t refcount, blk_t blk, int *ret) > > return 0; > > } > > > > -errcode_t ea_refcount_decrement(ext2_refcount_t refcount, blk_t blk, int *ret) > > +errcode_t ea_refcount_decrement(ext2_refcount_t refcount, blk64_t blk, int *ret) > > { > > struct ea_refcount_el *el; > > > > @@ -249,7 +249,7 @@ errcode_t ea_refcount_decrement(ext2_refcount_t refcount, blk_t blk, int *ret) > > return 0; > > } > > > > -errcode_t ea_refcount_store(ext2_refcount_t refcount, blk_t blk, int count) > > +errcode_t ea_refcount_store(ext2_refcount_t refcount, blk64_t blk, int count) > > { > > struct ea_refcount_el *el; > > > > @@ -263,7 +263,7 @@ errcode_t ea_refcount_store(ext2_refcount_t refcount, blk_t blk, int count) > > return 0; > > } > > > > -blk_t ext2fs_get_refcount_size(ext2_refcount_t refcount) > > +blk64_t ext2fs_get_refcount_size(ext2_refcount_t refcount) > > { > > if (!refcount) > > return 0; > > @@ -277,7 +277,7 @@ void ea_refcount_intr_begin(ext2_refcount_t refcount) > > } > > > > > > -blk_t ea_refcount_intr_next(ext2_refcount_t refcount, > > +blk64_t ea_refcount_intr_next(ext2_refcount_t refcount, > > int *ret) > > { > > struct ea_refcount_el *list; > > @@ -370,7 +370,7 @@ int main(int argc, char **argv) > > int i = 0; > > ext2_refcount_t refcount; > > int size, arg; > > - blk_t blk; > > + blk64_t blk; > > errcode_t retval; > > > > while (1) { > > @@ -394,7 +394,7 @@ int main(int argc, char **argv) > > printf("Freeing refcount\n"); > > break; > > case BCODE_STORE: > > - blk = (blk_t) bcode_program[i++]; > > + blk = (blk64_t) bcode_program[i++]; > > arg = bcode_program[i++]; > > printf("Storing blk %u with value %d\n", blk, arg); > > retval = ea_refcount_store(refcount, blk, arg); > > @@ -403,7 +403,7 @@ int main(int argc, char **argv) > > "while storing blk %u", blk); > > break; > > case BCODE_FETCH: > > - blk = (blk_t) bcode_program[i++]; > > + blk = (blk64_t) bcode_program[i++]; > > retval = ea_refcount_fetch(refcount, blk, &arg); > > if (retval) > > com_err("ea_refcount_fetch", retval, > > @@ -413,7 +413,7 @@ int main(int argc, char **argv) > > blk, arg); > > break; > > case BCODE_INCR: > > - blk = (blk_t) bcode_program[i++]; > > + blk = (blk64_t) bcode_program[i++]; > > retval = ea_refcount_increment(refcount, blk, &arg); > > if (retval) > > com_err("ea_refcount_increment", retval, > > @@ -423,7 +423,7 @@ int main(int argc, char **argv) > > blk, arg); > > break; > > case BCODE_DECR: > > - blk = (blk_t) bcode_program[i++]; > > + blk = (blk64_t) bcode_program[i++]; > > retval = ea_refcount_decrement(refcount, blk, &arg); > > if (retval) > > com_err("ea_refcount_decrement", retval, > > > > -- > > To unsubscribe from this list: send the line "unsubscribe linux-ext4" in > > the body of a message to majordomo@...r.kernel.org > > More majordomo info at http://vger.kernel.org/majordomo-info.html > > > -- > To unsubscribe from this list: send the line "unsubscribe linux-ext4" in > the body of a message to majordomo@...r.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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