From: Namjae Jeon Date: Thu, 25 Oct 2012 01:15:14 +0000 (+1100) Subject: fat: modify nfs mount option X-Git-Tag: next-20121029~1^2~34 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=49ac2b74cdc6c137543ca03ddbf481a9598667af;p=karo-tx-linux.git fat: modify nfs mount option This patchset eliminates the client side ESTALE errors when a FAT partition exported over NFS has its dentries evicted from the cache. One of the reasons for this error is lack of permanent inode numbers on FAT which makes it difficult to construct persistent file handles. This can be overcome by using fat_encode_fh() that include i_pos in file handle. Once the i_pos is available, it is only a matter of reading the directory entries from the disk clusters to locate the matching entry and rebuild the corresponding inode. We reached the conclusion support stable inode's read-only export first after discussing with OGAWA and Bruce. And will make it writable with some operation(unlink and rename) limitation next time. This patch: Provide two possible values 'stale_rw' and 'nostale_ro' for the -o nfs mount option. The first one allows all file operations but does not reduce ESTALE errors on memory constrained systems. The second one eliminates ESTALE errors but mounts the filesystem as read-only. Not specifying a value defaults to 'stale_rw'. Signed-off-by: Namjae Jeon Signed-off-by: Ravishankar N Signed-off-by: Amit Sahrawat Cc: OGAWA Hirofumi Cc: "J. Bruce Fields" Signed-off-by: Andrew Morton --- diff --git a/fs/fat/fat.h b/fs/fat/fat.h index 623f36f0423b..955784e6a993 100644 --- a/fs/fat/fat.h +++ b/fs/fat/fat.h @@ -23,6 +23,9 @@ #define FAT_ERRORS_PANIC 2 /* panic on error */ #define FAT_ERRORS_RO 3 /* remount r/o on error */ +#define FAT_NFS_STALE_RW 1 /* NFS RW support, can cause ESTALE */ +#define FAT_NFS_NOSTALE_RO 2 /* NFS RO support, no ESTALE issue */ + struct fat_mount_options { kuid_t fs_uid; kgid_t fs_gid; @@ -33,6 +36,7 @@ struct fat_mount_options { unsigned short shortname; /* flags for shortname display/create rule */ unsigned char name_check; /* r = relaxed, n = normal, s = strict */ unsigned char errors; /* On error: continue, panic, remount-ro */ + unsigned char nfs; /* NFS support: nostale_ro, stale_rw */ unsigned short allow_utime;/* permission for setting the [am]time */ unsigned quiet:1, /* set = fake successful chmods and chowns */ showexec:1, /* set = only set x bit for com/exe/bat */ @@ -47,8 +51,7 @@ struct fat_mount_options { usefree:1, /* Use free_clusters for FAT32 */ tz_utc:1, /* Filesystem timestamps are in UTC */ rodir:1, /* allow ATTR_RO for directory */ - discard:1, /* Issue discard requests on deletions */ - nfs:1; /* Do extra work needed for NFS export */ + discard:1; /* Issue discard requests on deletions */ }; #define FAT_HASH_BITS 8 diff --git a/fs/fat/inode.c b/fs/fat/inode.c index 5bafaad00530..40f0ef0e8d37 100644 --- a/fs/fat/inode.c +++ b/fs/fat/inode.c @@ -754,8 +754,6 @@ static int fat_show_options(struct seq_file *m, struct dentry *root) seq_puts(m, ",usefree"); if (opts->quiet) seq_puts(m, ",quiet"); - if (opts->nfs) - seq_puts(m, ",nfs"); if (opts->showexec) seq_puts(m, ",showexec"); if (opts->sys_immutable) @@ -785,6 +783,10 @@ static int fat_show_options(struct seq_file *m, struct dentry *root) seq_puts(m, ",errors=panic"); else seq_puts(m, ",errors=remount-ro"); + if (opts->nfs == FAT_NFS_NOSTALE_RO) + seq_puts(m, ",nfs=nostale_ro"); + else if (opts->nfs) + seq_puts(m, ",nfs=stale_rw"); if (opts->discard) seq_puts(m, ",discard"); @@ -800,7 +802,8 @@ enum { Opt_shortname_winnt, Opt_shortname_mixed, Opt_utf8_no, Opt_utf8_yes, Opt_uni_xl_no, Opt_uni_xl_yes, Opt_nonumtail_no, Opt_nonumtail_yes, Opt_obsolete, Opt_flush, Opt_tz_utc, Opt_rodir, Opt_err_cont, - Opt_err_panic, Opt_err_ro, Opt_discard, Opt_nfs, Opt_err, + Opt_err_panic, Opt_err_ro, Opt_discard, Opt_nfs_stale_rw, + Opt_nfs_nostale_ro, Opt_err, }; static const match_table_t fat_tokens = { @@ -829,7 +832,9 @@ static const match_table_t fat_tokens = { {Opt_err_panic, "errors=panic"}, {Opt_err_ro, "errors=remount-ro"}, {Opt_discard, "discard"}, - {Opt_nfs, "nfs"}, + {Opt_nfs_stale_rw, "nfs"}, + {Opt_nfs_stale_rw, "nfs=stale_rw"}, + {Opt_nfs_nostale_ro, "nfs=nostale_ro"}, {Opt_obsolete, "conv=binary"}, {Opt_obsolete, "conv=text"}, {Opt_obsolete, "conv=auto"}, @@ -1017,6 +1022,12 @@ static int parse_options(struct super_block *sb, char *options, int is_vfat, case Opt_err_ro: opts->errors = FAT_ERRORS_RO; break; + case Opt_nfs_stale_rw: + opts->nfs = FAT_NFS_STALE_RW; + break; + case Opt_nfs_nostale_ro: + opts->nfs = FAT_NFS_NOSTALE_RO; + break; /* msdos specific */ case Opt_dots: @@ -1075,9 +1086,6 @@ static int parse_options(struct super_block *sb, char *options, int is_vfat, case Opt_discard: opts->discard = 1; break; - case Opt_nfs: - opts->nfs = 1; - break; /* obsolete mount options */ case Opt_obsolete: @@ -1108,6 +1116,8 @@ out: opts->allow_utime = ~opts->fs_dmask & (S_IWGRP | S_IWOTH); if (opts->unicode_xlate) opts->utf8 = 0; + if (opts->nfs == FAT_NFS_NOSTALE_RO) + sb->s_flags |= MS_RDONLY; return 0; }