[U-Boot] [PATCH 03/17] fs: fat: make directory iterator global for write use
AKASHI Takahiro
takahiro.akashi at linaro.org
Mon Aug 20 04:45:24 UTC 2018
On Sat, Aug 11, 2018 at 03:34:20PM +0200, Heinrich Schuchardt wrote:
> On 07/20/2018 04:57 AM, AKASHI Takahiro wrote:
> > Directory iterator was introduced in major re-work of read operation by
> > Rob. We want to use it for write operation extensively as well.
> > This patch makes relevant functions, as well as iterator defition, visible
> > outside of fat.c.
> >
> > Signed-off-by: AKASHI Takahiro <takahiro.akashi at linaro.org>
> > ---
> > fs/fat/fat.c | 39 ++++++---------------------------------
> > include/fat.h | 32 ++++++++++++++++++++++++++++++++
> > 2 files changed, 38 insertions(+), 33 deletions(-)
> >
> > diff --git a/fs/fat/fat.c b/fs/fat/fat.c
> > index fd6523c66b..0f82cbe1bd 100644
> > --- a/fs/fat/fat.c
> > +++ b/fs/fat/fat.c
> > @@ -634,25 +634,6 @@ static int get_fs_info(fsdata *mydata)
> > * For more complete example, see fat_itr_resolve()
> > */
> >
> > -typedef struct {
> > - fsdata *fsdata; /* filesystem parameters */
> > - unsigned clust; /* current cluster */
> > - int last_cluster; /* set once we've read last cluster */
> > - int is_root; /* is iterator at root directory */
> > - int remaining; /* remaining dent's in current cluster */
> > -
> > - /* current iterator position values: */
> > - dir_entry *dent; /* current directory entry */
> > - char l_name[VFAT_MAXLEN_BYTES]; /* long (vfat) name */
> > - char s_name[14]; /* short 8.3 name */
> > - char *name; /* l_name if there is one, else s_name */
> > -
> > - /* storage for current cluster in memory: */
> > - u8 block[MAX_CLUSTSIZE] __aligned(ARCH_DMA_MINALIGN);
> > -} fat_itr;
> > -
> > -static int fat_itr_isdir(fat_itr *itr);
> > -
> > /**
> > * fat_itr_root() - initialize an iterator to start at the root
> > * directory
> > @@ -661,7 +642,7 @@ static int fat_itr_isdir(fat_itr *itr);
> > * @fsdata: filesystem data for the partition
> > * @return 0 on success, else -errno
> > */
> > -static int fat_itr_root(fat_itr *itr, fsdata *fsdata)
> > +int fat_itr_root(fat_itr *itr, fsdata *fsdata)
> > {
> > if (get_fs_info(fsdata))
> > return -ENXIO;
> > @@ -693,7 +674,7 @@ static int fat_itr_root(fat_itr *itr, fsdata *fsdata)
> > * @parent: the iterator pointing at a directory entry in the
> > * parent directory of the directory to iterate
> > */
> > -static void fat_itr_child(fat_itr *itr, fat_itr *parent)
> > +void fat_itr_child(fat_itr *itr, fat_itr *parent)
> > {
> > fsdata *mydata = parent->fsdata; /* for silly macros */
> > unsigned clustnum = START(parent->dent);
> > @@ -713,7 +694,7 @@ static void fat_itr_child(fat_itr *itr, fat_itr *parent)
> > itr->last_cluster = 0;
> > }
> >
> > -static void *next_cluster(fat_itr *itr)
> > +void *next_cluster(fat_itr *itr)
> > {
> > fsdata *mydata = itr->fsdata; /* for silly macros */
> > int ret;
> > @@ -834,7 +815,7 @@ static dir_entry *extract_vfat_name(fat_itr *itr)
> > * @return boolean, 1 if success or 0 if no more entries in the
> > * current directory
> > */
> > -static int fat_itr_next(fat_itr *itr)
> > +int fat_itr_next(fat_itr *itr)
> > {
> > dir_entry *dent;
> >
> > @@ -879,19 +860,11 @@ static int fat_itr_next(fat_itr *itr)
> > * @itr: the iterator
> > * @return true if cursor is at a directory
> > */
> > -static int fat_itr_isdir(fat_itr *itr)
> > +int fat_itr_isdir(fat_itr *itr)
> > {
> > return !!(itr->dent->attr & ATTR_DIR);
> > }
> >
> > -/*
> > - * Helpers:
> > - */
> > -
> > -#define TYPE_FILE 0x1
> > -#define TYPE_DIR 0x2
> > -#define TYPE_ANY (TYPE_FILE | TYPE_DIR)
> > -
> > /**
> > * fat_itr_resolve() - traverse directory structure to resolve the
> > * requested path.
> > @@ -907,7 +880,7 @@ static int fat_itr_isdir(fat_itr *itr)
> > * @type: bitmask of allowable file types
> > * @return 0 on success or -errno
> > */
> > -static int fat_itr_resolve(fat_itr *itr, const char *path, unsigned type)
> > +int fat_itr_resolve(fat_itr *itr, const char *path, unsigned type)
> > {
> > const char *next;
> >
> > diff --git a/include/fat.h b/include/fat.h
> > index 0c88b59a4a..577e6b4592 100644
> > --- a/include/fat.h
> > +++ b/include/fat.h
> > @@ -187,6 +187,38 @@ static inline u32 sect_to_clust(fsdata *fsdata, int sect)
> > return (sect - fsdata->data_begin) / fsdata->clust_size;
> > }
> >
> > +/*
> > + * Directory iterator
> > + */
> > +
> > +#define TYPE_FILE 0x1
> > +#define TYPE_DIR 0x2
> > +#define TYPE_ANY (TYPE_FILE | TYPE_DIR)
> > +
> > +typedef struct {
> > + fsdata *fsdata; /* filesystem parameters */
> > + unsigned clust; /* current cluster */
> > + int last_cluster; /* set once we've read last cluster */
> > + int is_root; /* is iterator at root directory */
> > + int remaining; /* remaining dent's in current cluster */
> > +
> > + /* current iterator position values: */
> > + dir_entry *dent; /* current directory entry */
> > + char l_name[VFAT_MAXLEN_BYTES]; /* long (vfat) name */
> > + char s_name[14]; /* short 8.3 name */
> > + char *name; /* l_name if there is one, else s_name */
> > +
> > + /* storage for current cluster in memory: */
> > + u8 block[MAX_CLUSTSIZE] __aligned(ARCH_DMA_MINALIGN);
>
> If CONFIG_FAT is not set, MAX_CLUSTSIZE is empty. And you get a build error:
>
> CC fs/fs.o
> In file included from fs/fs.c:12:0:
> include/fat.h:20:23: error: ‘CONFIG_FS_FAT_MAX_CLUSTSIZE’ undeclared
> here (not in a function); did you mean ‘CONFIG_SYS_MAX_FLASH_SECT’?
> #define MAX_CLUSTSIZE CONFIG_FS_FAT_MAX_CLUSTSIZE
> ^
> include/fat.h:214:19: note: in expansion of macro ‘MAX_CLUSTSIZE’
> u8 block[MAX_CLUSTSIZE] __aligned(ARCH_DMA_MINALIGN);
> ^~~~~~~~~~~~~
> make[1]: *** [scripts/Makefile.build:279: fs/fs.o] Error 1
Thank you for catching this.
> We should not assume that every board uses FAT.
The contents of include/fat.h is totally private to fat implementation.
So I'd like to guard this include file like:
#ifndef _FAT_H
#define _FAT_H
#ifdef CONFIG_FS_FAT
<fat definitions>...
#endif /* CONFIG_FS_FAT */
#endif /* _FAT_H */
-Takahiro AKASHI
> Best regards
>
> Heinrich
>
> > +} fat_itr;
> > +
> > +int fat_itr_root(fat_itr *itr, fsdata *fsdata);
> > +void fat_itr_child(fat_itr *itr, fat_itr *parent);
> > +void *next_cluster(fat_itr *itr);
> > +int fat_itr_next(fat_itr *itr);
> > +int fat_itr_isdir(fat_itr *itr);
> > +int fat_itr_resolve(fat_itr *itr, const char *path, unsigned type);
> > +
> > int file_fat_detectfs(void);
> > int fat_exists(const char *filename);
> > int fat_size(const char *filename, loff_t *size);
> >
>
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