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author | Al Viro <viro@zeniv.linux.org.uk> | 2013-05-17 22:08:53 +0200 |
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committer | Al Viro <viro@zeniv.linux.org.uk> | 2013-06-29 10:56:40 +0200 |
commit | 725bebb27882ae617d50776cc8b6cacd84481c91 (patch) | |
tree | 5a5cf7f5133820a3b2defcc545453aa7f8dbf04a /fs/ext4/dir.c | |
parent | [readdir] convert qnx6 (diff) | |
download | linux-725bebb27882ae617d50776cc8b6cacd84481c91.tar.xz linux-725bebb27882ae617d50776cc8b6cacd84481c91.zip |
[readdir] convert ext4
and trim the living hell out bogosities in inline dir case
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/ext4/dir.c')
-rw-r--r-- | fs/ext4/dir.c | 158 |
1 files changed, 67 insertions, 91 deletions
diff --git a/fs/ext4/dir.c b/fs/ext4/dir.c index f8d56e4254e0..3c7d288ae94c 100644 --- a/fs/ext4/dir.c +++ b/fs/ext4/dir.c @@ -29,8 +29,7 @@ #include "ext4.h" #include "xattr.h" -static int ext4_dx_readdir(struct file *filp, - void *dirent, filldir_t filldir); +static int ext4_dx_readdir(struct file *, struct dir_context *); /** * Check if the given dir-inode refers to an htree-indexed directory @@ -103,60 +102,56 @@ int __ext4_check_dir_entry(const char *function, unsigned int line, return 1; } -static int ext4_readdir(struct file *filp, - void *dirent, filldir_t filldir) +static int ext4_readdir(struct file *file, struct dir_context *ctx) { - int error = 0; unsigned int offset; int i, stored; struct ext4_dir_entry_2 *de; int err; - struct inode *inode = file_inode(filp); + struct inode *inode = file_inode(file); struct super_block *sb = inode->i_sb; - int ret = 0; int dir_has_error = 0; if (is_dx_dir(inode)) { - err = ext4_dx_readdir(filp, dirent, filldir); + err = ext4_dx_readdir(file, ctx); if (err != ERR_BAD_DX_DIR) { - ret = err; - goto out; + return err; } /* * We don't set the inode dirty flag since it's not * critical that it get flushed back to the disk. */ - ext4_clear_inode_flag(file_inode(filp), + ext4_clear_inode_flag(file_inode(file), EXT4_INODE_INDEX); } if (ext4_has_inline_data(inode)) { int has_inline_data = 1; - ret = ext4_read_inline_dir(filp, dirent, filldir, + int ret = ext4_read_inline_dir(file, ctx, &has_inline_data); if (has_inline_data) return ret; } stored = 0; - offset = filp->f_pos & (sb->s_blocksize - 1); + offset = ctx->pos & (sb->s_blocksize - 1); - while (!error && !stored && filp->f_pos < inode->i_size) { + while (ctx->pos < inode->i_size) { struct ext4_map_blocks map; struct buffer_head *bh = NULL; - map.m_lblk = filp->f_pos >> EXT4_BLOCK_SIZE_BITS(sb); + map.m_lblk = ctx->pos >> EXT4_BLOCK_SIZE_BITS(sb); map.m_len = 1; err = ext4_map_blocks(NULL, inode, &map, 0); if (err > 0) { pgoff_t index = map.m_pblk >> (PAGE_CACHE_SHIFT - inode->i_blkbits); - if (!ra_has_index(&filp->f_ra, index)) + if (!ra_has_index(&file->f_ra, index)) page_cache_sync_readahead( sb->s_bdev->bd_inode->i_mapping, - &filp->f_ra, filp, + &file->f_ra, file, index, 1); - filp->f_ra.prev_pos = (loff_t)index << PAGE_CACHE_SHIFT; + file->f_ra.prev_pos = (loff_t)index << PAGE_CACHE_SHIFT; bh = ext4_bread(NULL, inode, map.m_lblk, 0, &err); } @@ -166,16 +161,16 @@ static int ext4_readdir(struct file *filp, */ if (!bh) { if (!dir_has_error) { - EXT4_ERROR_FILE(filp, 0, + EXT4_ERROR_FILE(file, 0, "directory contains a " "hole at offset %llu", - (unsigned long long) filp->f_pos); + (unsigned long long) ctx->pos); dir_has_error = 1; } /* corrupt size? Maybe no more blocks to read */ - if (filp->f_pos > inode->i_blocks << 9) + if (ctx->pos > inode->i_blocks << 9) break; - filp->f_pos += sb->s_blocksize - offset; + ctx->pos += sb->s_blocksize - offset; continue; } @@ -183,21 +178,20 @@ static int ext4_readdir(struct file *filp, if (!buffer_verified(bh) && !ext4_dirent_csum_verify(inode, (struct ext4_dir_entry *)bh->b_data)) { - EXT4_ERROR_FILE(filp, 0, "directory fails checksum " + EXT4_ERROR_FILE(file, 0, "directory fails checksum " "at offset %llu", - (unsigned long long)filp->f_pos); - filp->f_pos += sb->s_blocksize - offset; + (unsigned long long)ctx->pos); + ctx->pos += sb->s_blocksize - offset; brelse(bh); continue; } set_buffer_verified(bh); -revalidate: /* If the dir block has changed since the last call to * readdir(2), then we might be pointing to an invalid * dirent right now. Scan from the start of the block * to make sure. */ - if (filp->f_version != inode->i_version) { + if (file->f_version != inode->i_version) { for (i = 0; i < sb->s_blocksize && i < offset; ) { de = (struct ext4_dir_entry_2 *) (bh->b_data + i); @@ -214,57 +208,46 @@ revalidate: sb->s_blocksize); } offset = i; - filp->f_pos = (filp->f_pos & ~(sb->s_blocksize - 1)) + ctx->pos = (ctx->pos & ~(sb->s_blocksize - 1)) | offset; - filp->f_version = inode->i_version; + file->f_version = inode->i_version; } - while (!error && filp->f_pos < inode->i_size + while (ctx->pos < inode->i_size && offset < sb->s_blocksize) { de = (struct ext4_dir_entry_2 *) (bh->b_data + offset); - if (ext4_check_dir_entry(inode, filp, de, bh, + if (ext4_check_dir_entry(inode, file, de, bh, bh->b_data, bh->b_size, offset)) { /* - * On error, skip the f_pos to the next block + * On error, skip to the next block */ - filp->f_pos = (filp->f_pos | + ctx->pos = (ctx->pos | (sb->s_blocksize - 1)) + 1; - brelse(bh); - ret = stored; - goto out; + break; } offset += ext4_rec_len_from_disk(de->rec_len, sb->s_blocksize); if (le32_to_cpu(de->inode)) { - /* We might block in the next section - * if the data destination is - * currently swapped out. So, use a - * version stamp to detect whether or - * not the directory has been modified - * during the copy operation. - */ - u64 version = filp->f_version; - - error = filldir(dirent, de->name, + if (!dir_emit(ctx, de->name, de->name_len, - filp->f_pos, le32_to_cpu(de->inode), - get_dtype(sb, de->file_type)); - if (error) - break; - if (version != filp->f_version) - goto revalidate; - stored++; + get_dtype(sb, de->file_type))) { + brelse(bh); + return 0; + } } - filp->f_pos += ext4_rec_len_from_disk(de->rec_len, + ctx->pos += ext4_rec_len_from_disk(de->rec_len, sb->s_blocksize); } offset = 0; brelse(bh); + if (ctx->pos < inode->i_size) { + if (!dir_relax(inode)) + return 0; + } } -out: - return ret; + return 0; } static inline int is_32bit_api(void) @@ -492,16 +475,12 @@ int ext4_htree_store_dirent(struct file *dir_file, __u32 hash, * for all entres on the fname linked list. (Normally there is only * one entry on the linked list, unless there are 62 bit hash collisions.) */ -static int call_filldir(struct file *filp, void *dirent, - filldir_t filldir, struct fname *fname) +static int call_filldir(struct file *file, struct dir_context *ctx, + struct fname *fname) { - struct dir_private_info *info = filp->private_data; - loff_t curr_pos; - struct inode *inode = file_inode(filp); - struct super_block *sb; - int error; - - sb = inode->i_sb; + struct dir_private_info *info = file->private_data; + struct inode *inode = file_inode(file); + struct super_block *sb = inode->i_sb; if (!fname) { ext4_msg(sb, KERN_ERR, "%s:%d: inode #%lu: comm %s: " @@ -509,47 +488,44 @@ static int call_filldir(struct file *filp, void *dirent, inode->i_ino, current->comm); return 0; } - curr_pos = hash2pos(filp, fname->hash, fname->minor_hash); + ctx->pos = hash2pos(file, fname->hash, fname->minor_hash); while (fname) { - error = filldir(dirent, fname->name, - fname->name_len, curr_pos, + if (!dir_emit(ctx, fname->name, + fname->name_len, fname->inode, - get_dtype(sb, fname->file_type)); - if (error) { - filp->f_pos = curr_pos; + get_dtype(sb, fname->file_type))) { info->extra_fname = fname; - return error; + return 1; } fname = fname->next; } return 0; } -static int ext4_dx_readdir(struct file *filp, - void *dirent, filldir_t filldir) +static int ext4_dx_readdir(struct file *file, struct dir_context *ctx) { - struct dir_private_info *info = filp->private_data; - struct inode *inode = file_inode(filp); + struct dir_private_info *info = file->private_data; + struct inode *inode = file_inode(file); struct fname *fname; int ret; if (!info) { - info = ext4_htree_create_dir_info(filp, filp->f_pos); + info = ext4_htree_create_dir_info(file, ctx->pos); if (!info) return -ENOMEM; - filp->private_data = info; + file->private_data = info; } - if (filp->f_pos == ext4_get_htree_eof(filp)) + if (ctx->pos == ext4_get_htree_eof(file)) return 0; /* EOF */ /* Some one has messed with f_pos; reset the world */ - if (info->last_pos != filp->f_pos) { + if (info->last_pos != ctx->pos) { free_rb_tree_fname(&info->root); info->curr_node = NULL; info->extra_fname = NULL; - info->curr_hash = pos2maj_hash(filp, filp->f_pos); - info->curr_minor_hash = pos2min_hash(filp, filp->f_pos); + info->curr_hash = pos2maj_hash(file, ctx->pos); + info->curr_minor_hash = pos2min_hash(file, ctx->pos); } /* @@ -557,7 +533,7 @@ static int ext4_dx_readdir(struct file *filp, * chain, return them first. */ if (info->extra_fname) { - if (call_filldir(filp, dirent, filldir, info->extra_fname)) + if (call_filldir(file, ctx, info->extra_fname)) goto finished; info->extra_fname = NULL; goto next_node; @@ -571,17 +547,17 @@ static int ext4_dx_readdir(struct file *filp, * cached entries. */ if ((!info->curr_node) || - (filp->f_version != inode->i_version)) { + (file->f_version != inode->i_version)) { info->curr_node = NULL; free_rb_tree_fname(&info->root); - filp->f_version = inode->i_version; - ret = ext4_htree_fill_tree(filp, info->curr_hash, + file->f_version = inode->i_version; + ret = ext4_htree_fill_tree(file, info->curr_hash, info->curr_minor_hash, &info->next_hash); if (ret < 0) return ret; if (ret == 0) { - filp->f_pos = ext4_get_htree_eof(filp); + ctx->pos = ext4_get_htree_eof(file); break; } info->curr_node = rb_first(&info->root); @@ -590,7 +566,7 @@ static int ext4_dx_readdir(struct file *filp, fname = rb_entry(info->curr_node, struct fname, rb_hash); info->curr_hash = fname->hash; info->curr_minor_hash = fname->minor_hash; - if (call_filldir(filp, dirent, filldir, fname)) + if (call_filldir(file, ctx, fname)) break; next_node: info->curr_node = rb_next(info->curr_node); @@ -601,7 +577,7 @@ static int ext4_dx_readdir(struct file *filp, info->curr_minor_hash = fname->minor_hash; } else { if (info->next_hash == ~0) { - filp->f_pos = ext4_get_htree_eof(filp); + ctx->pos = ext4_get_htree_eof(file); break; } info->curr_hash = info->next_hash; @@ -609,7 +585,7 @@ static int ext4_dx_readdir(struct file *filp, } } finished: - info->last_pos = filp->f_pos; + info->last_pos = ctx->pos; return 0; } @@ -624,7 +600,7 @@ static int ext4_release_dir(struct inode *inode, struct file *filp) const struct file_operations ext4_dir_operations = { .llseek = ext4_dir_llseek, .read = generic_read_dir, - .readdir = ext4_readdir, + .iterate = ext4_readdir, .unlocked_ioctl = ext4_ioctl, #ifdef CONFIG_COMPAT .compat_ioctl = ext4_compat_ioctl, |