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author | Michael Ellerman <michael@ellerman.id.au> | 2007-09-19 04:38:12 (GMT) |
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committer | Paul Mackerras <paulus@samba.org> | 2007-09-19 05:12:19 (GMT) |
commit | 7af1443a9d319132087e1e9a3984b94c6998835c (patch) | |
tree | a38fbc03da6201e89a9e850115433df724eba7a4 /arch/powerpc/platforms/cell/spufs/coredump.c | |
parent | e55014923e65e4ee8e477a1212381cca0125f3aa (diff) | |
download | linux-7af1443a9d319132087e1e9a3984b94c6998835c.tar.xz |
[POWERPC] spufs: Handle errors in SPU coredump code, and support coredump to a pipe
Rework spufs_coredump_extra_notes_write() to check for and return errors.
If we're coredumping to a pipe we can't trust file->f_pos, we need to
maintain the foffset value passed to us. The cleanest way to do this is
to have the low level write routine increment foffset when we've
successfully written.
Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc/platforms/cell/spufs/coredump.c')
-rw-r--r-- | arch/powerpc/platforms/cell/spufs/coredump.c | 89 |
1 files changed, 62 insertions, 27 deletions
diff --git a/arch/powerpc/platforms/cell/spufs/coredump.c b/arch/powerpc/platforms/cell/spufs/coredump.c index 6c20e44..6b8aef6 100644 --- a/arch/powerpc/platforms/cell/spufs/coredump.c +++ b/arch/powerpc/platforms/cell/spufs/coredump.c @@ -51,19 +51,34 @@ static ssize_t do_coredump_read(int num, struct spu_context *ctx, void *buffer, * These are the only things you should do on a core-file: use only these * functions to write out all the necessary info. */ -static int spufs_dump_write(struct file *file, const void *addr, int nr) +static int spufs_dump_write(struct file *file, const void *addr, int nr, loff_t *foffset) { - return file->f_op->write(file, addr, nr, &file->f_pos) == nr; + ssize_t written; + + written = file->f_op->write(file, addr, nr, &file->f_pos); + *foffset += written; + + if (written != nr) + return -EIO; + + return 0; } -static int spufs_dump_seek(struct file *file, loff_t off) +static int spufs_dump_align(struct file *file, char *buf, loff_t new_off, + loff_t *foffset) { - if (file->f_op->llseek) { - if (file->f_op->llseek(file, off, 0) != off) - return 0; - } else - file->f_pos = off; - return 1; + int rc, size; + + size = min((loff_t)PAGE_SIZE, new_off - *foffset); + memset(buf, 0, size); + + rc = 0; + while (rc == 0 && new_off > *foffset) { + size = min((loff_t)PAGE_SIZE, new_off - *foffset); + rc = spufs_dump_write(file, buf, size, foffset); + } + + return rc; } static int spufs_ctx_note_size(struct spu_context *ctx, int dfd) @@ -141,11 +156,11 @@ int spufs_coredump_extra_notes_size(void) return size; } -static void spufs_arch_write_note(struct spu_context *ctx, int i, - struct file *file, int dfd) +static int spufs_arch_write_note(struct spu_context *ctx, int i, + struct file *file, int dfd, loff_t *foffset) { loff_t pos = 0; - int sz, rc, total = 0; + int sz, rc, nread, total = 0; const int bufsz = PAGE_SIZE; char *name; char fullname[80], *buf; @@ -153,7 +168,7 @@ static void spufs_arch_write_note(struct spu_context *ctx, int i, buf = (void *)get_zeroed_page(GFP_KERNEL); if (!buf) - return; + return -ENOMEM; name = spufs_coredump_read[i].name; sz = spufs_coredump_read[i].size; @@ -163,40 +178,60 @@ static void spufs_arch_write_note(struct spu_context *ctx, int i, en.n_descsz = sz; en.n_type = NT_SPU; - if (!spufs_dump_write(file, &en, sizeof(en))) + rc = spufs_dump_write(file, &en, sizeof(en), foffset); + if (rc) goto out; - if (!spufs_dump_write(file, fullname, en.n_namesz)) + + rc = spufs_dump_write(file, fullname, en.n_namesz, foffset); + if (rc) goto out; - if (!spufs_dump_seek(file, roundup((unsigned long)file->f_pos, 4))) + + rc = spufs_dump_align(file, buf, roundup(*foffset, 4), foffset); + if (rc) goto out; do { - rc = do_coredump_read(i, ctx, buf, bufsz, &pos); - if (rc > 0) { - if (!spufs_dump_write(file, buf, rc)) + nread = do_coredump_read(i, ctx, buf, bufsz, &pos); + if (nread > 0) { + rc = spufs_dump_write(file, buf, nread, foffset); + if (rc) goto out; - total += rc; + total += nread; } - } while (rc == bufsz && total < sz); + } while (nread == bufsz && total < sz); + + if (nread < 0) { + rc = nread; + goto out; + } + + rc = spufs_dump_align(file, buf, roundup(*foffset - total + sz, 4), + foffset); - spufs_dump_seek(file, roundup((unsigned long)file->f_pos - - total + sz, 4)); out: free_page((unsigned long)buf); + return rc; } -void spufs_coredump_extra_notes_write(struct file *file) +int spufs_coredump_extra_notes_write(struct file *file, loff_t *foffset) { struct spu_context *ctx; - int fd, j; + int fd, j, rc; fd = 0; while ((ctx = coredump_next_context(&fd)) != NULL) { spu_acquire_saved(ctx); - for (j = 0; spufs_coredump_read[j].name != NULL; j++) - spufs_arch_write_note(ctx, j, file, fd); + for (j = 0; spufs_coredump_read[j].name != NULL; j++) { + rc = spufs_arch_write_note(ctx, j, file, fd, foffset); + if (rc) { + spu_release_saved(ctx); + return rc; + } + } spu_release_saved(ctx); } + + return 0; } |