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Message-ID: <20200526071754.33819-6-yi.zhang@huawei.com> Date: Tue, 26 May 2020 15:17:49 +0800 From: "zhangyi (F)" <yi.zhang@...wei.com> To: <linux-ext4@...r.kernel.org> CC: <tytso@....edu>, <jack@...e.cz>, <adilger.kernel@...ger.ca>, <yi.zhang@...wei.com>, <zhangxiaoxu5@...wei.com> Subject: [PATCH 05/10] ext4: replace sb_bread*() with ext4_sb_bread*() For the cases of sb_bread() and sb_bread_unmovable(), we also need to check the buffer is actually uptodate or not and fix the uptodate flag. Add a wrapper function ext4_sb_bread_unmovable() and replace all sb_bread*() with ext4_sb_bread*(). Signed-off-by: zhangyi (F) <yi.zhang@...wei.com> --- fs/ext4/ext4.h | 17 +++++++++++++++-- fs/ext4/indirect.c | 6 +++--- fs/ext4/resize.c | 12 ++++++------ fs/ext4/super.c | 33 +++++++++++++++++++-------------- 4 files changed, 43 insertions(+), 25 deletions(-) diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index 2ee76efd029b..609c2b555d29 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -2763,8 +2763,9 @@ extern struct buffer_head *__ext4_sb_getblk_gfp(struct super_block *sb, gfp_t gfp); extern struct buffer_head *__ext4_sb_getblk(struct super_block *sb, sector_t block, bool lock); -extern struct buffer_head *ext4_sb_bread(struct super_block *sb, - sector_t block, int op_flags); +extern struct buffer_head *__ext4_sb_bread_gfp(struct super_block *sb, + sector_t block, int op_flags, + gfp_t gfp); extern int ext4_seq_options_show(struct seq_file *seq, void *offset); extern int ext4_calculate_overhead(struct super_block *sb); extern void ext4_superblock_csum_set(struct super_block *sb); @@ -2969,6 +2970,18 @@ ext4_sb_getblk_locked(struct super_block *sb, sector_t block) return __ext4_sb_getblk(sb, block, true); } +static inline struct buffer_head * +ext4_sb_bread(struct super_block *sb, sector_t block, int op_flags) +{ + return __ext4_sb_bread_gfp(sb, block, op_flags, __GFP_MOVABLE); +} + +static inline struct buffer_head * +ext4_sb_bread_unmovable(struct super_block *sb, sector_t block) +{ + return __ext4_sb_bread_gfp(sb, block, 0, 0); +} + static inline int ext4_has_metadata_csum(struct super_block *sb) { WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) && diff --git a/fs/ext4/indirect.c b/fs/ext4/indirect.c index 8dcbf21439c1..bd4d86211ab8 100644 --- a/fs/ext4/indirect.c +++ b/fs/ext4/indirect.c @@ -1012,14 +1012,14 @@ static void ext4_free_branches(handle_t *handle, struct inode *inode, } /* Go read the buffer for the next level down */ - bh = sb_bread(inode->i_sb, nr); + bh = ext4_sb_bread(inode->i_sb, nr, 0); /* * A read failure? Report error and clear slot * (should be rare). */ - if (!bh) { - ext4_error_inode_block(inode, nr, EIO, + if (IS_ERR(bh)) { + ext4_error_inode_block(inode, nr, PTR_ERR(bh), "Read failure"); continue; } diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c index 414198e4d873..ff018e63bb55 100644 --- a/fs/ext4/resize.c +++ b/fs/ext4/resize.c @@ -1806,10 +1806,10 @@ int ext4_group_extend(struct super_block *sb, struct ext4_super_block *es, o_blocks_count + add, add); /* See if the device is actually as big as what was requested */ - bh = sb_bread(sb, o_blocks_count + add - 1); - if (!bh) { + bh = ext4_sb_bread(sb, o_blocks_count + add - 1, 0); + if (IS_ERR(bh)) { ext4_warning(sb, "can't read last block, resize aborted"); - return -ENOSPC; + return PTR_ERR(bh); } brelse(bh); @@ -1932,10 +1932,10 @@ int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count) int meta_bg; /* See if the device is actually as big as what was requested */ - bh = sb_bread(sb, n_blocks_count - 1); - if (!bh) { + bh = ext4_sb_bread(sb, n_blocks_count - 1, 0); + if (IS_ERR(bh)) { ext4_warning(sb, "can't read last block, resize aborted"); - return -ENOSPC; + return PTR_ERR(bh); } brelse(bh); diff --git a/fs/ext4/super.c b/fs/ext4/super.c index 111fff55fada..b9aab334a5d0 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -194,17 +194,18 @@ __ext4_sb_getblk(struct super_block *sb, sector_t block, bool lock) } /* - * This works like sb_bread() except it uses ERR_PTR for error - * returns. Currently with sb_bread it's impossible to distinguish - * between ENOMEM and EIO situations (since both result in a NULL - * return. + * This works like __bread_gfp() except it allow to pass op_flags and + * uses ERR_PTR for error returns. Currently with sb_bread it's + * impossible to distinguish between ENOMEM and EIO situations (since + * both result in a NULL return. */ struct buffer_head * -ext4_sb_bread(struct super_block *sb, sector_t block, int op_flags) +__ext4_sb_bread_gfp(struct super_block *sb, sector_t block, + int op_flags, gfp_t gfp) { struct buffer_head *bh; - bh = ext4_sb_getblk_locked(sb, block); + bh = ext4_sb_getblk_locked_gfp(sb, block, gfp); if (bh == NULL) return ERR_PTR(-ENOMEM); if (buffer_uptodate(bh)) @@ -3777,8 +3778,10 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent) logical_sb_block = sb_block; } - if (!(bh = sb_bread_unmovable(sb, logical_sb_block))) { - ext4_msg(sb, KERN_ERR, "unable to read superblock"); + bh = ext4_sb_bread_unmovable(sb, logical_sb_block); + if (IS_ERR(bh)) { + ext4_msg(sb, KERN_ERR, + "unable to read superblock: %ld", PTR_ERR(bh)); goto out_fail; } /* @@ -4175,10 +4178,11 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent) brelse(bh); logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE; offset = do_div(logical_sb_block, blocksize); - bh = sb_bread_unmovable(sb, logical_sb_block); - if (!bh) { + bh = ext4_sb_bread_unmovable(sb, logical_sb_block); + if (IS_ERR(bh)) { ext4_msg(sb, KERN_ERR, - "Can't read superblock on 2nd try"); + "Can't read superblock on 2nd try: %ld", + PTR_ERR(bh)); goto failed_mount; } es = (struct ext4_super_block *)(bh->b_data + offset); @@ -4398,10 +4402,11 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent) struct buffer_head *bh; block = descriptor_loc(sb, logical_sb_block, i); - bh = sb_bread_unmovable(sb, block); - if (!bh) { + bh = ext4_sb_bread_unmovable(sb, block); + if (IS_ERR(bh)) { ext4_msg(sb, KERN_ERR, - "can't read group descriptor %d", i); + "can't read group descriptor %d: %ld", + i, PTR_ERR(bh)); db_count = i; goto failed_mount2; } -- 2.21.3
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