[GFS2] Update ioctl() to new interface
This is designed as a fs independent way to set flags on a particular inode. The values of the ioctl() and flags are designed to be identical to the ext2/3 values. Assuming that this plan is acceptable to people in general, the plan is to then move other fs across to using the same set of #defines, etc. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
This commit is contained in:
Steven Whitehouse
parent
e3167ded1f
commit
7ea9ea8322
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@ -21,6 +21,7 @@
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#include <linux/gfs2_ondisk.h>
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#include <linux/ext2_fs.h>
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#include <linux/crc32.h>
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#include <linux/iflags.h>
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#include <asm/semaphore.h>
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#include <asm/uaccess.h>
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@ -536,110 +537,44 @@ static int gfs2_readdir(struct file *file, void *dirent, filldir_t filldir)
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return error;
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}
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const struct gfs2_flag_eattr {
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u32 flag;
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u32 ext2;
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} gfs2_flag_eattrs[] = {
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{
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.flag = GFS2_DIF_IMMUTABLE,
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.ext2 = EXT2_IMMUTABLE_FL,
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}, {
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.flag = GFS2_DIF_APPENDONLY,
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.ext2 = EXT2_APPEND_FL,
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}, {
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.flag = GFS2_DIF_JDATA,
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.ext2 = EXT2_JOURNAL_DATA_FL,
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}, {
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.flag = GFS2_DIF_EXHASH,
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.ext2 = EXT2_INDEX_FL,
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}, {
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.flag = GFS2_DIF_EA_INDIRECT,
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}, {
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.flag = GFS2_DIF_DIRECTIO,
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}, {
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.flag = GFS2_DIF_NOATIME,
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.ext2 = EXT2_NOATIME_FL,
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}, {
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.flag = GFS2_DIF_SYNC,
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.ext2 = EXT2_SYNC_FL,
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}, {
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.flag = GFS2_DIF_SYSTEM,
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}, {
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.flag = GFS2_DIF_TRUNC_IN_PROG,
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}, {
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.flag = GFS2_DIF_INHERIT_JDATA,
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}, {
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.flag = GFS2_DIF_INHERIT_DIRECTIO,
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}, {
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},
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static const u32 iflags_to_gfs2[32] = {
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[iflag_Sync] = GFS2_DIF_SYNC,
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[iflag_Immutable] = GFS2_DIF_IMMUTABLE,
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[iflag_Append] = GFS2_DIF_APPENDONLY,
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[iflag_NoAtime] = GFS2_DIF_NOATIME,
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[iflag_Index] = GFS2_DIF_EXHASH,
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[iflag_JournalData] = GFS2_DIF_JDATA,
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[iflag_DirectIO] = GFS2_DIF_DIRECTIO,
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[iflag_InheritDirectIO] = GFS2_DIF_INHERIT_DIRECTIO,
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[iflag_InheritJdata] = GFS2_DIF_INHERIT_JDATA,
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};
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static const struct gfs2_flag_eattr *get_by_ext2(u32 ext2)
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{
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const struct gfs2_flag_eattr *p = gfs2_flag_eattrs;
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for(; p->flag; p++) {
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if (ext2 == p->ext2)
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return p;
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}
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return NULL;
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}
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static const u32 gfs2_to_iflags[32] = {
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[gfs2fl_Sync] = IFLAG_SYNC,
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[gfs2fl_Immutable] = IFLAG_IMMUTABLE,
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[gfs2fl_AppendOnly] = IFLAG_APPEND,
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[gfs2fl_NoAtime] = IFLAG_NOATIME,
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[gfs2fl_ExHash] = IFLAG_INDEX,
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[gfs2fl_Jdata] = IFLAG_JOURNAL_DATA,
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[gfs2fl_Directio] = IFLAG_DIRECTIO,
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[gfs2fl_InheritDirectio] = IFLAG_INHERITDIRECTIO,
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[gfs2fl_InheritJdata] = IFLAG_INHERITJDATA,
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};
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static const struct gfs2_flag_eattr *get_by_gfs2(u32 gfs2)
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{
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const struct gfs2_flag_eattr *p = gfs2_flag_eattrs;
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for(; p->flag; p++) {
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if (gfs2 == p->flag)
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return p;
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}
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return NULL;
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}
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static u32 gfs2_flags_to_ext2(u32 gfs2)
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{
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const struct gfs2_flag_eattr *ea;
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u32 ext2 = 0;
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u32 mask = 1;
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for(; mask != 0; mask <<=1) {
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if (mask & gfs2) {
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ea = get_by_gfs2(mask);
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if (ea)
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ext2 |= ea->ext2;
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}
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}
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return ext2;
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}
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static int gfs2_flags_from_ext2(u32 *gfs2, u32 ext2)
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{
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const struct gfs2_flag_eattr *ea;
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u32 mask = 1;
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for(; mask != 0; mask <<= 1) {
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if (mask & ext2) {
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ea = get_by_ext2(mask);
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if (ea == NULL)
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return -EINVAL;
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*gfs2 |= ea->flag;
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}
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}
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return 0;
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}
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static int get_ext2_flags(struct inode *inode, u32 __user *ptr)
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static int gfs2_get_flags(struct inode *inode, u32 __user *ptr)
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{
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struct gfs2_inode *ip = inode->u.generic_ip;
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struct gfs2_holder gh;
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int error;
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u32 ext2;
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u32 iflags;
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gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &gh);
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error = gfs2_glock_nq_m_atime(1, &gh);
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if (error)
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return error;
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ext2 = gfs2_flags_to_ext2(ip->i_di.di_flags);
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if (put_user(ext2, ptr))
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iflags = iflags_cvt(gfs2_to_iflags, ip->i_di.di_flags);
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if (put_user(iflags, ptr))
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error = -EFAULT;
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gfs2_glock_dq_m(1, &gh);
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@ -665,7 +600,7 @@ static int get_ext2_flags(struct inode *inode, u32 __user *ptr)
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* @mask: Indicates which flags are valid
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*
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*/
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static int gfs2_set_flags(struct inode *inode, u32 flags, u32 mask)
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static int do_gfs2_set_flags(struct inode *inode, u32 flags, u32 mask)
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{
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struct gfs2_inode *ip = inode->u.generic_ip;
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struct buffer_head *bh;
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@ -717,24 +652,23 @@ out:
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return error;
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}
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static int set_ext2_flags(struct inode *inode, u32 __user *ptr)
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static int gfs2_set_flags(struct inode *inode, u32 __user *ptr)
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{
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u32 ext2, gfs2;
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if (get_user(ext2, ptr))
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u32 iflags, gfsflags;
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if (get_user(iflags, ptr))
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return -EFAULT;
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if (gfs2_flags_from_ext2(&gfs2, ext2))
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return -EINVAL;
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return gfs2_set_flags(inode, gfs2, ~0);
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gfsflags = iflags_cvt(iflags_to_gfs2, iflags);
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return do_gfs2_set_flags(inode, gfsflags, ~0);
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}
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int gfs2_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
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unsigned long arg)
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{
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switch(cmd) {
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case EXT2_IOC_GETFLAGS:
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return get_ext2_flags(inode, (u32 __user *)arg);
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case EXT2_IOC_SETFLAGS:
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return set_ext2_flags(inode, (u32 __user *)arg);
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case IFLAGS_GET_IOC:
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return gfs2_get_flags(inode, (u32 __user *)arg);
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case IFLAGS_SET_IOC:
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return gfs2_set_flags(inode, (u32 __user *)arg);
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}
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return -ENOTTY;
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}
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@ -197,6 +197,22 @@ struct gfs2_quota {
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#define DT2IF(dt) (((dt) << 12) & S_IFMT)
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#define IF2DT(sif) (((sif) & S_IFMT) >> 12)
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enum {
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gfs2fl_Jdata = 0,
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gfs2fl_ExHash = 1,
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gfs2fl_Unused = 2,
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gfs2fl_EaIndirect = 3,
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gfs2fl_Directio = 4,
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gfs2fl_Immutable = 5,
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gfs2fl_AppendOnly = 6,
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gfs2fl_NoAtime = 7,
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gfs2fl_Sync = 8,
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gfs2fl_System = 9,
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gfs2fl_TruncInProg = 29,
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gfs2fl_InheritDirectio = 30,
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gfs2fl_InheritJdata = 31,
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};
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/* Dinode flags */
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#define GFS2_DIF_JDATA 0x00000001
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#define GFS2_DIF_EXHASH 0x00000002
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104
include/linux/iflags.h
Normal file
104
include/linux/iflags.h
Normal file
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@ -0,0 +1,104 @@
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#ifndef _LINUX_IFLAGS_H
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#define _LINUX_IFLAGS_H
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/*
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* A universal set of inode flags.
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*
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* Originally taken from ext2/3 with additions for other filesystems.
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* Filesystems supporting this interface should interoperate with
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* the lsattr and chattr command line tools.
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*
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* This interface is supported in whole or in part by:
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* ext2
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* ext3
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* xfs
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* jfs
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* gfs2
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*
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*/
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#define IFLAGS_GET_IOC _IOR('f', 1, long)
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#define IFLAGS_SET_IOC _IOW('f', 2, long)
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/*
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* These values are provided for use as indices of an array
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* for use with the iflags_cvt function below
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*/
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enum {
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iflag_SecureRm = 0, /* Secure deletion */
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iflag_Unrm = 1, /* Undelete */
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iflag_Compress = 2, /* Compress file */
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iflag_Sync = 3, /* Synchronous updates */
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iflag_Immutable = 4, /* Immutable */
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iflag_Append = 5, /* Append */
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iflag_NoDump = 6, /* Don't dump file */
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iflag_NoAtime = 7, /* No atime updates */
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/* Reserved for compression usage */
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iflag_Dirty = 8,
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iflag_ComprBlk = 9, /* One or more compressed clusters */
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iflag_NoComp = 10, /* Don't compress */
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iflag_Ecompr = 11, /* Compression error */
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/* End of compression flags */
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iflag_Btree = 12, /* btree format dir */
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iflag_Index = 12, /* hash-indexed directory */
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iflag_Imagic = 13, /* AFS directory */
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iflag_JournalData = 14, /* file data should be journaled */
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iflag_NoTail = 15, /* file tail should not be merged */
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iflag_DirSync = 16, /* dirsync behaviour */
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iflag_TopDir = 17, /* Top of directory hierarchies */
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iflag_DirectIO = 18, /* Always use direct I/O on this file */
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iflag_InheritDirectIO = 19, /* Set DirectIO on new files in dir */
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iflag_InheritJdata = 20, /* Set JournalData on create in dir */
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iflag_Reserved = 31 /* reserved for ext2/3 lib */
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};
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#define __IFL(x) (1<<(iflag_##x))
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#define IFLAG_SECRM __IFL(SecureRm) /* 0x00000001 */
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#define IFLAG_UNRM __IFL(Unrm) /* 0x00000002 */
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#define IFLAG_COMPR __IFL(Compr) /* 0x00000004 */
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#define IFLAG_SYNC __IFL(Sync) /* 0x00000008 */
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#define IFLAG_IMMUTABLE __IFL(Immutable) /* 0x00000010 */
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#define IFLAG_APPEND __IFL(Append) /* 0x00000020 */
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#define IFLAG_NODUMP __IFL(NoDump) /* 0x00000040 */
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#define IFLAG_NOATIME __IFL(NoAtime) /* 0x00000080 */
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#define IFLAG_DIRTY __IFL(Dirty) /* 0x00000100 */
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#define IFLAG_COMPRBLK __IFL(ComprBlk) /* 0x00000200 */
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#define IFLAG_NOCOMP __IFL(NoComp) /* 0x00000400 */
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#define IFLAG_ECOMPR __IFL(Ecompr) /* 0x00000800 */
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#define IFLAG_BTREE __IFL(Btree) /* 0x00001000 */
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#define IFLAG_INDEX __IFL(Index) /* 0x00001000 */
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#define IFLAG_IMAGIC __IFL(Imagic) /* 0x00002000 */
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#define IFLAG_JOURNAL_DATA __IFL(JournalData) /* 0x00004000 */
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#define IFLAG_NOTAIL __IFL(NoTail) /* 0x00008000 */
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#define IFLAG_DIRSYNC __IFL(DirSync) /* 0x00010000 */
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#define IFLAG_TOPDIR __IFL(TopDir) /* 0x00020000 */
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#define IFLAG_DIRECTIO __IFL(DirectIO) /* 0x00040000 */
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#define IFLAG_INHERITDIRECTIO __IFL(InheritDirectIO) /* 0x00080000 */
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#define IFLAG_INHERITJDATA __IFL(InheritJdata) /* 0x00100000 */
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#define IFLAG_RESERVED __IFL(Reserved) /* 0x80000000 */
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#ifdef __KERNEL__
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/**
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* iflags_cvt
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* @table: A table of 32 u32 flags
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* @val: a 32 bit value to convert
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*
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* This function can be used to convert between IFLAGS values and
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* the filesystem's own flags values.
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*
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* Returns: the converted flags
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*/
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static inline u32 iflags_cvt(const u32 *table, u32 val)
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{
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u32 res = 0;
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while(val) {
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if (val & 1)
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res |= *table;
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table++;
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val >>= 1;
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}
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return res;
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}
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#endif /* __KERNEL__ */
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#endif /* _LINUX_IFLAGS_H */
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