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fs: fat: consistent error handling for flush_dir()

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Provide function description for flush_dir().
Move all error messages for flush_dir() from the callers to the function.
Move mapping of errors to -EIO to the function.
Always check return value of flush_dir() (Coverity CID 316362).

In fat_unlink() return -EIO if flush_dirty_fat_buffer() fails.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
This commit is contained in:
Heinrich Schuchardt 2021-01-20 22:21:53 +01:00
parent 184aa65041
commit e97eb638de
1 changed files with 31 additions and 27 deletions
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58
fs/fat/fat_write.c
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@ -418,8 +418,12 @@ fill_dir_slot(fat_itr *itr, const char *l_name, const char *shortname)
slotptr--;
counter--;
if (itr->remaining == 0)
flush_dir(itr);
if (!itr->remaining) {
/* Write directory table to device */
ret = flush_dir(itr);
if (ret)
return ret;
}
next_dent(itr);
if (!itr->dent)
@ -639,15 +643,23 @@ set_cluster(fsdata *mydata, u32 clustnum, u8 *buffer, u32 size)
buffer, size);
}
static int
flush_dir(fat_itr *itr)
/**
* flush_dir() - flush directory
*
* @itr: directory iterator
* Return: 0 for success, -EIO on error
*/
static int flush_dir(fat_itr *itr)
{
fsdata *mydata = itr->fsdata;
u32 startsect, sect_offset, nsects;
int ret;
if (!itr->is_root || mydata->fatsize == 32)
return set_cluster(mydata, itr->clust, itr->block,
mydata->clust_size * mydata->sect_size);
if (!itr->is_root || mydata->fatsize == 32) {
ret = set_cluster(mydata, itr->clust, itr->block,
mydata->clust_size * mydata->sect_size);
goto out;
}
sect_offset = itr->clust * mydata->clust_size;
startsect = mydata->rootdir_sect + sect_offset;
@ -655,8 +667,14 @@ flush_dir(fat_itr *itr)
nsects = min_t(u32, mydata->clust_size,
mydata->rootdir_size - sect_offset);
return set_sectors(mydata, startsect, itr->block,
nsects * mydata->sect_size);
ret = set_sectors(mydata, startsect, itr->block,
nsects * mydata->sect_size);
out:
if (ret) {
log_err("Error: writing directory entry\n");
return -EIO;
}
return 0;
}
/*
@ -1390,10 +1408,6 @@ int file_fat_write_at(const char *filename, loff_t pos, void *buffer,
/* Write directory table to device */
ret = flush_dir(itr);
if (ret) {
printf("Error: writing directory entry\n");
ret = -EIO;
}
exit:
free(filename_copy);
@ -1458,12 +1472,8 @@ static int delete_single_dentry(fat_itr *itr)
memset(dent, 0, sizeof(*dent));
dent->name[0] = DELETED_FLAG;
if (!itr->remaining) {
if (flush_dir(itr)) {
printf("error: writing directory entry\n");
return -EIO;
}
}
if (!itr->remaining)
return flush_dir(itr);
return 0;
}
@ -1530,12 +1540,7 @@ static int delete_dentry_long(fat_itr *itr)
}
/* Delete short name */
delete_single_dentry(itr);
if (flush_dir(itr)) {
printf("error: writing directory entry\n");
return -EIO;
}
return 0;
return flush_dir(itr);
}
int fat_unlink(const char *filename)
@ -1739,13 +1744,12 @@ int fat_mkdir(const char *new_dirname)
ret = flush_dirty_fat_buffer(mydata);
if (ret) {
printf("Error: flush fat buffer\n");
ret = -EIO;
goto exit;
}
/* Write directory table to device */
ret = flush_dir(itr);
if (ret)
printf("Error: writing directory entry\n");
exit:
free(dirname_copy);