diff options
Diffstat (limited to 'fs/fat/inode.c')
| -rw-r--r-- | fs/fat/inode.c | 21 |
1 files changed, 14 insertions, 7 deletions
diff --git a/fs/fat/inode.c b/fs/fat/inode.c index 65cb54bde48..2c55e8dce79 100644 --- a/fs/fat/inode.c +++ b/fs/fat/inode.c @@ -25,6 +25,7 @@ #include <linux/parser.h> #include <linux/uio.h> #include <linux/writeback.h> +#include <linux/log2.h> #include <asm/unaligned.h> #ifndef CONFIG_FAT_DEFAULT_IOCHARSET @@ -824,6 +825,8 @@ static int fat_show_options(struct seq_file *m, struct vfsmount *mnt) } if (opts->name_check != 'n') seq_printf(m, ",check=%c", opts->name_check); + if (opts->usefree) + seq_puts(m, ",usefree"); if (opts->quiet) seq_puts(m, ",quiet"); if (opts->showexec) @@ -849,7 +852,7 @@ static int fat_show_options(struct seq_file *m, struct vfsmount *mnt) enum { Opt_check_n, Opt_check_r, Opt_check_s, Opt_uid, Opt_gid, - Opt_umask, Opt_dmask, Opt_fmask, Opt_codepage, Opt_nocase, + Opt_umask, Opt_dmask, Opt_fmask, Opt_codepage, Opt_usefree, Opt_nocase, Opt_quiet, Opt_showexec, Opt_debug, Opt_immutable, Opt_dots, Opt_nodots, Opt_charset, Opt_shortname_lower, Opt_shortname_win95, @@ -871,6 +874,7 @@ static match_table_t fat_tokens = { {Opt_dmask, "dmask=%o"}, {Opt_fmask, "fmask=%o"}, {Opt_codepage, "codepage=%u"}, + {Opt_usefree, "usefree"}, {Opt_nocase, "nocase"}, {Opt_quiet, "quiet"}, {Opt_showexec, "showexec"}, @@ -950,7 +954,7 @@ static int parse_options(char *options, int is_vfat, int silent, int *debug, opts->quiet = opts->showexec = opts->sys_immutable = opts->dotsOK = 0; opts->utf8 = opts->unicode_xlate = 0; opts->numtail = 1; - opts->nocase = 0; + opts->usefree = opts->nocase = 0; *debug = 0; if (!options) @@ -978,6 +982,9 @@ static int parse_options(char *options, int is_vfat, int silent, int *debug, case Opt_check_n: opts->name_check = 'n'; break; + case Opt_usefree: + opts->usefree = 1; + break; case Opt_nocase: if (!is_vfat) opts->nocase = 1; @@ -1217,8 +1224,7 @@ int fat_fill_super(struct super_block *sb, void *data, int silent, } logical_sector_size = le16_to_cpu(get_unaligned((__le16 *)&b->sector_size)); - if (!logical_sector_size - || (logical_sector_size & (logical_sector_size - 1)) + if (!is_power_of_2(logical_sector_size) || (logical_sector_size < 512) || (PAGE_CACHE_SIZE < logical_sector_size)) { if (!silent) @@ -1228,8 +1234,7 @@ int fat_fill_super(struct super_block *sb, void *data, int silent, goto out_invalid; } sbi->sec_per_clus = b->sec_per_clus; - if (!sbi->sec_per_clus - || (sbi->sec_per_clus & (sbi->sec_per_clus - 1))) { + if (!is_power_of_2(sbi->sec_per_clus)) { if (!silent) printk(KERN_ERR "FAT: bogus sectors per cluster %u\n", sbi->sec_per_clus); @@ -1305,7 +1310,9 @@ int fat_fill_super(struct super_block *sb, void *data, int silent, le32_to_cpu(fsinfo->signature2), sbi->fsinfo_sector); } else { - sbi->free_clusters = le32_to_cpu(fsinfo->free_clusters); + if (sbi->options.usefree) + sbi->free_clusters = + le32_to_cpu(fsinfo->free_clusters); sbi->prev_free = le32_to_cpu(fsinfo->next_cluster); } |