From: "Darrick J. Wong" Subject: [PATCH 01/47] libext2fs: Read and write full size inodes Date: Sat, 08 Oct 2011 00:33:22 -0700 Message-ID: <20111008073322.17888.47205.stgit@elm3c44.beaverton.ibm.com> References: <20111008073315.17888.22132.stgit@elm3c44.beaverton.ibm.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Cc: Sunil Mushran , Amir Goldstein , Andi Kleen , Mingming Cao , Joel Becker , linux-ext4@vger.kernel.org, Coly Li To: Andreas Dilger , Theodore Tso , "Darrick J. Wong" Return-path: Received: from e1.ny.us.ibm.com ([32.97.182.141]:44809 "EHLO e1.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750891Ab1JHHgE (ORCPT ); Sat, 8 Oct 2011 03:36:04 -0400 Received: from /spool/local by us.ibm.com with XMail ESMTP for from ; Sat, 8 Oct 2011 03:36:03 -0400 Received: from d01av04.pok.ibm.com (d01av04.pok.ibm.com [9.56.224.64]) by d01relay04.pok.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id p987XPV1272956 for ; Sat, 8 Oct 2011 03:33:25 -0400 Received: from d01av04.pok.ibm.com (loopback [127.0.0.1]) by d01av04.pok.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id p987XNBj011492 for ; Sat, 8 Oct 2011 03:33:25 -0400 In-Reply-To: <20111008073315.17888.22132.stgit@elm3c44.beaverton.ibm.com> Sender: linux-ext4-owner@vger.kernel.org List-ID: Change libext2fs to read and write full-size inodes in preparation for the metadata checksumming patchset, which will require this. Due to ABI compatibility requirements, this change must be hidden from client programs. Signed-off-by: Darrick J. Wong --- e2fsck/pass1.c | 3 + lib/ext2fs/ext2fsP.h | 2 - lib/ext2fs/inode.c | 139 +++++++++++++++++++++++++++++--------------------- 3 files changed, 83 insertions(+), 61 deletions(-) diff --git a/e2fsck/pass1.c b/e2fsck/pass1.c index 7ce6697..d051703 100644 --- a/e2fsck/pass1.c +++ b/e2fsck/pass1.c @@ -680,7 +680,8 @@ void e2fsck_pass1(e2fsck_t ctx) } block_buf = (char *) e2fsck_allocate_memory(ctx, fs->blocksize * 3, "block interate buffer"); - e2fsck_use_inode_shortcuts(ctx, 1); + if (EXT2_INODE_SIZE(fs->super) == EXT2_GOOD_OLD_INODE_SIZE) + e2fsck_use_inode_shortcuts(ctx, 1); old_op = ehandler_operation(_("opening inode scan")); pctx.errcode = ext2fs_open_inode_scan(fs, ctx->inode_buffer_blocks, &scan); diff --git a/lib/ext2fs/ext2fsP.h b/lib/ext2fs/ext2fsP.h index b182d7f..7da0d90 100644 --- a/lib/ext2fs/ext2fsP.h +++ b/lib/ext2fs/ext2fsP.h @@ -73,7 +73,7 @@ struct ext2_inode_cache { struct ext2_inode_cache_ent { ext2_ino_t ino; - struct ext2_inode inode; + struct ext2_inode *inode; }; /* Function prototypes */ diff --git a/lib/ext2fs/inode.c b/lib/ext2fs/inode.c index 6c524ff..7b0db60 100644 --- a/lib/ext2fs/inode.c +++ b/lib/ext2fs/inode.c @@ -74,7 +74,9 @@ errcode_t ext2fs_flush_icache(ext2_filsys fs) static errcode_t create_icache(ext2_filsys fs) { + int i; errcode_t retval; + void *p; if (fs->icache) return 0; @@ -93,13 +95,20 @@ static errcode_t create_icache(ext2_filsys fs) fs->icache->cache_size = 4; fs->icache->refcount = 1; retval = ext2fs_get_array(fs->icache->cache_size, - sizeof(struct ext2_inode_cache_ent), + sizeof(struct ext2_inode_cache_ent) + + EXT2_INODE_SIZE(fs->super), &fs->icache->cache); if (retval) { ext2fs_free_mem(&fs->icache->buffer); ext2fs_free_mem(&fs->icache); return retval; } + + for (i = 0, p = (void *)(fs->icache->cache + fs->icache->cache_size); + i < fs->icache->cache_size; + i++, p += EXT2_INODE_SIZE(fs->super)) + fs->icache->cache[i].inode = p; + ext2fs_flush_icache(fs); return 0; } @@ -407,6 +416,8 @@ errcode_t ext2fs_get_next_inode_full(ext2_inode_scan scan, ext2_ino_t *ino, { errcode_t retval; int extra_bytes = 0; + const int length = EXT2_INODE_SIZE(scan->fs->super); + struct ext2_inode *iptr = inode; EXT2_CHECK_MAGIC(scan, EXT2_ET_MAGIC_INODE_SCAN); @@ -469,6 +480,12 @@ errcode_t ext2fs_get_next_inode_full(ext2_inode_scan scan, ext2_ino_t *ino, #endif } + if (bufsize < length) { + retval = ext2fs_get_mem(length, &iptr); + if (retval) + return retval; + } + retval = 0; if (extra_bytes) { memcpy(scan->temp_buffer+extra_bytes, scan->ptr, @@ -477,26 +494,26 @@ errcode_t ext2fs_get_next_inode_full(ext2_inode_scan scan, ext2_ino_t *ino, scan->bytes_left -= scan->inode_size - extra_bytes; #ifdef WORDS_BIGENDIAN - memset(inode, 0, bufsize); + memset(iptr, 0, length); ext2fs_swap_inode_full(scan->fs, - (struct ext2_inode_large *) inode, + (struct ext2_inode_large *) iptr, (struct ext2_inode_large *) scan->temp_buffer, - 0, bufsize); + 0, length); #else - *inode = *((struct ext2_inode *) scan->temp_buffer); + memcpy(iptr, scan->temp_buffer, length); #endif if (scan->scan_flags & EXT2_SF_BAD_EXTRA_BYTES) retval = EXT2_ET_BAD_BLOCK_IN_INODE_TABLE; scan->scan_flags &= ~EXT2_SF_BAD_EXTRA_BYTES; } else { #ifdef WORDS_BIGENDIAN - memset(inode, 0, bufsize); + memset(iptr, 0, length); ext2fs_swap_inode_full(scan->fs, - (struct ext2_inode_large *) inode, + (struct ext2_inode_large *) iptr, (struct ext2_inode_large *) scan->ptr, - 0, bufsize); + 0, length); #else - memcpy(inode, scan->ptr, bufsize); + memcpy(iptr, scan->ptr, length); #endif scan->ptr += scan->inode_size; scan->bytes_left -= scan->inode_size; @@ -507,6 +524,10 @@ errcode_t ext2fs_get_next_inode_full(ext2_inode_scan scan, ext2_ino_t *ino, scan->inodes_left--; scan->current_inode++; *ino = scan->current_inode; + if (inode != iptr) { + memcpy(inode, iptr, bufsize); + ext2fs_free_mem(&iptr); + } return retval; } @@ -527,8 +548,10 @@ errcode_t ext2fs_read_inode_full(ext2_filsys fs, ext2_ino_t ino, unsigned long group, block, offset; char *ptr; errcode_t retval; - int clen, i, inodes_per_block, length; + int clen, i, inodes_per_block; io_channel io; + int length = EXT2_INODE_SIZE(fs->super); + struct ext2_inode *iptr = inode; EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS); @@ -547,13 +570,10 @@ errcode_t ext2fs_read_inode_full(ext2_filsys fs, ext2_ino_t ino, return retval; } /* Check to see if it's in the inode cache */ - if (bufsize == sizeof(struct ext2_inode)) { - /* only old good inode can be retrieved from the cache */ - for (i=0; i < fs->icache->cache_size; i++) { - if (fs->icache->cache[i].ino == ino) { - *inode = fs->icache->cache[i].inode; - return 0; - } + for (i = 0; i < fs->icache->cache_size; i++) { + if (fs->icache->cache[i].ino == ino) { + memcpy(inode, fs->icache->cache[i].inode, bufsize); + return 0; } } if (fs->flags & EXT2_FLAG_IMAGE_FILE) { @@ -578,11 +598,13 @@ errcode_t ext2fs_read_inode_full(ext2_filsys fs, ext2_ino_t ino, } offset &= (EXT2_BLOCK_SIZE(fs->super) - 1); - length = EXT2_INODE_SIZE(fs->super); - if (bufsize < length) - length = bufsize; + if (bufsize < length) { + retval = ext2fs_get_mem(length, &iptr); + if (retval) + return retval; + } - ptr = (char *) inode; + ptr = (char *) iptr; while (length) { clen = length; if ((offset + length) > fs->blocksize) @@ -604,18 +626,24 @@ errcode_t ext2fs_read_inode_full(ext2_filsys fs, ext2_ino_t ino, ptr += clen; block_nr++; } + length = EXT2_INODE_SIZE(fs->super); #ifdef WORDS_BIGENDIAN - ext2fs_swap_inode_full(fs, (struct ext2_inode_large *) inode, - (struct ext2_inode_large *) inode, - 0, bufsize); + ext2fs_swap_inode_full(fs, (struct ext2_inode_large *) iptr, + (struct ext2_inode_large *) iptr, + 0, length); #endif /* Update the inode cache */ fs->icache->cache_last = (fs->icache->cache_last + 1) % fs->icache->cache_size; fs->icache->cache[fs->icache->cache_last].ino = ino; - fs->icache->cache[fs->icache->cache_last].inode = *inode; + memcpy(fs->icache->cache[fs->icache->cache_last].inode, iptr, length); + + if (iptr != inode) { + memcpy(inode, iptr, bufsize); + ext2fs_free_mem(&iptr); + } return 0; } @@ -633,9 +661,10 @@ errcode_t ext2fs_write_inode_full(ext2_filsys fs, ext2_ino_t ino, blk64_t block_nr; unsigned long group, block, offset; errcode_t retval = 0; - struct ext2_inode_large temp_inode, *w_inode; + struct ext2_inode_large *w_inode; char *ptr; - int clen, i, length; + int clen, i; + int length = EXT2_INODE_SIZE(fs->super); EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS); @@ -646,46 +675,43 @@ errcode_t ext2fs_write_inode_full(ext2_filsys fs, ext2_ino_t ino, return retval; } + if ((ino == 0) || (ino > fs->super->s_inodes_count)) + return EXT2_ET_BAD_INODE_NUM; + + /* Prepare our shadow buffer for read/modify/byteswap/write */ + retval = ext2fs_get_mem(length, &w_inode); + if (retval) + return retval; + if (bufsize < length) + retval = ext2fs_read_inode_full(fs, ino, + (struct ext2_inode *)w_inode, + length); + if (retval) + goto errout; + /* Check to see if the inode cache needs to be updated */ if (fs->icache) { for (i=0; i < fs->icache->cache_size; i++) { if (fs->icache->cache[i].ino == ino) { - fs->icache->cache[i].inode = *inode; + memcpy(fs->icache->cache[i].inode, inode, + bufsize); break; } } } else { retval = create_icache(fs); if (retval) - return retval; + goto errout; } + memcpy(w_inode, inode, bufsize); - if (!(fs->flags & EXT2_FLAG_RW)) - return EXT2_ET_RO_FILSYS; - - if ((ino == 0) || (ino > fs->super->s_inodes_count)) - return EXT2_ET_BAD_INODE_NUM; - - length = bufsize; - if (length < EXT2_INODE_SIZE(fs->super)) - length = EXT2_INODE_SIZE(fs->super); - - if (length > (int) sizeof(struct ext2_inode_large)) { - w_inode = malloc(length); - if (!w_inode) { - retval = ENOMEM; - goto errout; - } - } else - w_inode = &temp_inode; - memset(w_inode, 0, length); + if (!(fs->flags & EXT2_FLAG_RW)) { + retval = EXT2_ET_RO_FILSYS; + goto errout; + } #ifdef WORDS_BIGENDIAN - ext2fs_swap_inode_full(fs, w_inode, - (struct ext2_inode_large *) inode, - 1, bufsize); -#else - memcpy(w_inode, inode, bufsize); + ext2fs_swap_inode_full(fs, w_inode, w_inode, 1, length); #endif group = (ino - 1) / EXT2_INODES_PER_GROUP(fs->super); @@ -700,10 +726,6 @@ errcode_t ext2fs_write_inode_full(ext2_filsys fs, ext2_ino_t ino, offset &= (EXT2_BLOCK_SIZE(fs->super) - 1); - length = EXT2_INODE_SIZE(fs->super); - if (length > bufsize) - length = bufsize;