From 25885a35a72007cf28ec5f9ba7169c5c798f7167 Mon Sep 17 00:00:00 2001 From: Al Viro Date: Tue, 16 Aug 2022 11:57:56 -0400 Subject: Change calling conventions for filldir_t filldir_t instances (directory iterators callbacks) used to return 0 for "OK, keep going" or -E... for "stop". Note that it's *NOT* how the error values are reported - the rules for those are callback-dependent and ->iterate{,_shared}() instances only care about zero vs. non-zero (look at emit_dir() and friends). So let's just return bool ("should we keep going?") - it's less confusing that way. The choice between "true means keep going" and "true means stop" is bikesheddable; we have two groups of callbacks - do something for everything in directory, until we run into problem and find an entry in directory and do something to it. The former tended to use 0/-E... conventions - -E on failure. The latter tended to use 0/1, 1 being "stop, we are done". The callers treated anything non-zero as "stop", ignoring which non-zero value did they get. "true means stop" would be more natural for the second group; "true means keep going" - for the first one. I tried both variants and the things like if allocation failed something = -ENOMEM; return true; just looked unnatural and asking for trouble. [folded suggestion from Matthew Wilcox ] Acked-by: Christian Brauner (Microsoft) Signed-off-by: Al Viro --- fs/overlayfs/readdir.c | 28 ++++++++++++++-------------- 1 file changed, 14 insertions(+), 14 deletions(-) (limited to 'fs/overlayfs/readdir.c') diff --git a/fs/overlayfs/readdir.c b/fs/overlayfs/readdir.c index 78f62cc1797b..8c25d185cdc0 100644 --- a/fs/overlayfs/readdir.c +++ b/fs/overlayfs/readdir.c @@ -170,7 +170,7 @@ static struct ovl_cache_entry *ovl_cache_entry_new(struct ovl_readdir_data *rdd, return p; } -static int ovl_cache_entry_add_rb(struct ovl_readdir_data *rdd, +static bool ovl_cache_entry_add_rb(struct ovl_readdir_data *rdd, const char *name, int len, u64 ino, unsigned int d_type) { @@ -179,22 +179,22 @@ static int ovl_cache_entry_add_rb(struct ovl_readdir_data *rdd, struct ovl_cache_entry *p; if (ovl_cache_entry_find_link(name, len, &newp, &parent)) - return 0; + return true; p = ovl_cache_entry_new(rdd, name, len, ino, d_type); if (p == NULL) { rdd->err = -ENOMEM; - return -ENOMEM; + return false; } list_add_tail(&p->l_node, rdd->list); rb_link_node(&p->node, parent, newp); rb_insert_color(&p->node, rdd->root); - return 0; + return true; } -static int ovl_fill_lowest(struct ovl_readdir_data *rdd, +static bool ovl_fill_lowest(struct ovl_readdir_data *rdd, const char *name, int namelen, loff_t offset, u64 ino, unsigned int d_type) { @@ -211,7 +211,7 @@ static int ovl_fill_lowest(struct ovl_readdir_data *rdd, list_add_tail(&p->l_node, &rdd->middle); } - return rdd->err; + return rdd->err == 0; } void ovl_cache_free(struct list_head *list) @@ -250,7 +250,7 @@ static void ovl_cache_put(struct ovl_dir_file *od, struct dentry *dentry) } } -static int ovl_fill_merge(struct dir_context *ctx, const char *name, +static bool ovl_fill_merge(struct dir_context *ctx, const char *name, int namelen, loff_t offset, u64 ino, unsigned int d_type) { @@ -528,7 +528,7 @@ fail: goto out; } -static int ovl_fill_plain(struct dir_context *ctx, const char *name, +static bool ovl_fill_plain(struct dir_context *ctx, const char *name, int namelen, loff_t offset, u64 ino, unsigned int d_type) { @@ -540,11 +540,11 @@ static int ovl_fill_plain(struct dir_context *ctx, const char *name, p = ovl_cache_entry_new(rdd, name, namelen, ino, d_type); if (p == NULL) { rdd->err = -ENOMEM; - return -ENOMEM; + return false; } list_add_tail(&p->l_node, rdd->list); - return 0; + return true; } static int ovl_dir_read_impure(struct path *path, struct list_head *list, @@ -648,7 +648,7 @@ struct ovl_readdir_translate { bool xinowarn; }; -static int ovl_fill_real(struct dir_context *ctx, const char *name, +static bool ovl_fill_real(struct dir_context *ctx, const char *name, int namelen, loff_t offset, u64 ino, unsigned int d_type) { @@ -1027,7 +1027,7 @@ void ovl_cleanup_whiteouts(struct ovl_fs *ofs, struct dentry *upper, inode_unlock(upper->d_inode); } -static int ovl_check_d_type(struct dir_context *ctx, const char *name, +static bool ovl_check_d_type(struct dir_context *ctx, const char *name, int namelen, loff_t offset, u64 ino, unsigned int d_type) { @@ -1036,12 +1036,12 @@ static int ovl_check_d_type(struct dir_context *ctx, const char *name, /* Even if d_type is not supported, DT_DIR is returned for . and .. */ if (!strncmp(name, ".", namelen) || !strncmp(name, "..", namelen)) - return 0; + return true; if (d_type != DT_UNKNOWN) rdd->d_type_supported = true; - return 0; + return true; } /* -- cgit v1.2.3